For 5$ it is a neat toy. Realistically it's designed from the ground-up to have a much more powerful desktop doing any real computing. Hence, the "link" part. Anyway, it's underpowered, single core, 1ghz arm, 512M of memory. For the regular price of $50 there are better options, but at just $5, it's interesting.

Arcing is just about impossible. However the fuse and/or circuit breaker is most likely rated for less than 200 volts. Under rated circuit breakers and fuses may not disconnect higher voltages than their rating. OP will likely have no issues until an over current happens. The it will be a gamble of it may safe-fully disconnect or may catch fire. Voltage and Amp ratings are for both normal situations and what happens when things go bad. It may go very bad with wrong ratings.

I am fine with the given risk. Many places it's permited to play baseball. There is a risk of damaging windows, property and inflicting injury on anyone withing several hundred feet. The risk is low, and damnages are expected to be paid for anyone outside of the event. It's still allowed, not because it's safe, because the risk damange is low.

Silly putty and a Dremel of course requires at least some amount of practice and skill. At some point 3d printing will just require a criminal, stealing a 3d printer...

There are better arguments against fingerprint locks. They can't be changed even when they need to be. If more than one place is using a fingerprint, they have all the keys.

Today, anyone with some determination and a few photographs can replicate keys. How soon will it be till the average criminal has access to an instant key duplicator? A high quality scanner could mark the end of even the top rated physical keys.

How many people are still looking for the jet-pack on GTA5?

Of all the things that benefit from being free software, games aren't entirely gaining. A game with source code include all the "spoilers". Part of the magic of a new game is exploring, not drudging though code (an entirely different game). If there is anything given less criticism, let it be games. Sometime it's entertaining to be surprised. That is a games intended purpose, to entertain.

History lessons don't count today.
Today, or any time after about 1991, general encryption available to the public became unbreakable (PGP). Breaking older code happened because they where breakable. Today, this is not the case. To actually break todays code, no one can. They break the systems they run on. For anyone to continue as it was before is not to ask if one can break codes, it's to ask to break everyone's system. Intentionally crippling security is less security than is already available. Unfortunately our "enemies" can just not use our systems and we are to be left with crippled implementations. It is a disadvantage that doesn't support the goals stated.

Please don't hide whom it is that I might accidentally do business with. Nothing is going to change just sending them an email, they may even go after you for doing so. However you may stop others from being suckered when their poor security becomes everyone else's problem. It's not their problem, it's going to be everyone else's.

First assumption is that there isn't somewhere that'll get broken. Everywhere probably will get successfully attacked at some point. Use a password manager. At least this way, when somewhere is broken, I'm sure that it's the only place where that password is used.

Everything is an approximation. Any real signal of any type will contain noise. Analog has a signal/noise ratio for a given design, while digital has the same. Changing a signal into ones and zeros does add noise, however so does everything else.

Flash chips do not normally contain JTAG. The WRT54G and phones using ARM have TJAG in the processor. It's for recovery and debugging, allowing the processor to be stopped and manipulated from a computer. If the processor works, TJTAG and USB could be an option.

I would have to recommend against using JTAG. The cheap adapters cost something which is more than free included USB. It is also dog slow. My much older phone would take over 30hours to copy across JTAG with a speed of 256KBs. USB running at full speed still takes around 10min. Newer phones ship with Gigabytes worth of flash, making JTAG alone unreasonable.

As for your phone. If any part of the proccessor/usb still works you can copy out the flash. It works well for software bricks and could help if at least some of the hardware still works.
If you have to recover the flash by its self, jigs to do so are costly.
http://www.glassechidna.com.au/products/heimdall/

How many handsets and how far away to you make calls. For less than 5 handsets or mostly local calls, a simple, simple hardware pbx is still king. It's just not worth the trouble of setting up several thousand dollars worth of gear just to have options you're probably not going to use. Samsung and Tadaran make simple boxes that don't randomly crash or require hours and hours of setup and maintenance.
Voip starts to make sense when you need to have access to phones outside of the office. Asterisk does a good job of patching into any other PBX as a voicemail service and routing calls in/out to voip. Normal calls don't get dropped and VOIP is still a less reliable but still functioning option.
Voip only makes sense when there are many phone in many places with many changes. It's a up front cost of testing all network gear for working QOS. Routers, switches and you're ISP has to have working QOS. When you need everything to talk with everything else, there when you have many many handsets in many places, then worry about having open communications.
For small business though, simple hardware pbx with a few extra ports give options to open it up later.

Without removing you in the process, how can you're identity be stolen. Stolen identity is surely possible while breaking a multitude of other laws. How is lying to the creditor, to receive illicit gains, not just fraud? If I tell the bank I'm the damn Queen of England, it surely isn't a problem for the Queen of England is it?