What do you expect from running 10 and more amperes through a cord?
Well , I expect enough engineering behind it that the cord and connections don't melt. I am an auto electrician, I routinely deal with 12v systems that draw much more than that without melting, using connections that aren't much bigger. It's not like it's some mystical technology, it's just that this setup has been done on a budget.
But it doesn't help that every single logic gate in a graphics card is run at a speed/currents that are literally just below meltdown.
If they are house-bound, organise with a local taxi driver to get to the shop and get some things for them.
If they are mostly-mobile, same thing, but organise a drop off and pickup time and get a hand with getting groceries into the house and up stairs, etc.
A lot of the older "career" drivers will happily do regular stuff like this. Especially during the middle of the day in suburbia when it's pretty quiet. Beats sitting at a taxi rank reading the paper.