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There is 2GB of memory for the OS, personal settings, apps, etc. If you can not boot the device, you can not access this memory to clear it. You may be SOL.
To extort money from someone, you need to threaten them with something. Netflix has no leverage because their customers will most often have no choice in ISPs.
Comcast etc sell their customers phone numbers to illicit third parties. I ended up having to throw together an Asterix system with a simple "no solicitations, press one to continue" message to filter out all the robo-calls I got when I was forced to switch services over to Comcast.
This means no public internet, it will forever now be a private enterprise. Not sure I like that possibility in the long run given how the ISP monopolies behave.
I always cringe a bit when I see the "put web cams in your house! For security!" commercials. It's just a mater of time until Xfinity or what not get's compromised and all those web cams you use to check your kids get used by other people... to "check your kids".
But it is impossible to "not use any confidential information he had access to" without surgery. It's in your brain, you will use it if the situation arises.