It's entirely irrelevant when we're talking about 44.1kHz audio, which is what we are. The cable would have to be ghastly to the point of basically not working at all to bugger up 44.1KHz audio, even uncompressed (which is only 1.5Mbit/sec)
The question is: is the signal-to-noise ratio good enough? If so a cheap cable that passes the data is every bit as good as an expensive one, so long as the packets arrive intact at the other end.
Ethernet already does a lot to counter noise. The signals are differential pairs (so instead of having ground and signal, you have signal+ and signal-). The wire pairs are twisted, which keeps them in close proximity. Interference tends to be common mode noise (so for two wires close together it will affect the signal in each wire almost the same), and differential amplifiers are designed to only amplify the difference between the two wires and will therefore reject common mode noise. Each end also has an isolating transformer, and each end has proper termination (to avoid things like reflections which can bugger up signal integrity). It takes a significantly terrible out-of-spec twisted pair cable to make ethernet stop working.
Incidentally, the signalling for 100baseTX ethernet only has a fundamental frequency of 31.25MHz (naively people would expect 1MHz per 1Mbps but this is not so). 100baseTX uses a 3 level (in other words +1, 0, -1) non return to zero signalling (in other words, a 1 will cause the signal to change level and a 0 will cause the signal to remain at the current level - or it might be the other way around, it's a long time since I did this stuff). Each 4 bits is encoded into a 5 bit symbol designed to prevent long runs of 0s (which would cause the signal level to remain constant for too long). Lots of people call an ethernet connection a "broadband" connection, but it's not, it's baseband (hence the "base" in 100baseTX).
Yes. Switching computers on my KVM switch (scroll lock + console number)
I'd have to question that (not that she has to do it or the reasons she was told, but the supposed reality that elders can't read normal text as well as caps). One of the pieces of research that was done here in the 1950s resulted in motorway road signs in the UK being in mixed case rather than all caps - it caused howls of anguish from old-timers resistant to change - but the thing is words with lower case text have more of a shape - for instance "Manchester" can be resolved as the word "Manchester" much faster than "MANCHESTER" - it was found you could read the mixed case before you could even resolve all the letters because you could recognise the shape of the word, given that lower case text has more features like ascenders and descenders. Hence all UK road signs ever since have been in mixed case.
Drones are subject to the same rules that RC aircraft are subject to.
It is however extremely hard to enforce. RC users are generally pretty responsible - they've probably spent many hours building their aircraft, and during this time it has sunk in the dangers they can pose, and usually they've joined a local club to help them learn to fly their new expensive aircraft and the club will also coach them on safely operating their aircraft.
Drone users not so much. Many of the ready-to-fly drones require pretty much zero skill to operate, so people can take off and cause mischief pretty much straight away.