There is a term we use here in NZ for people that do this sort of thing.
We call them BUTCHERS.
Strange how the opposite ends of the planet use the same terms Trumpy
Used to see them a lot in the early 90s here when I was working as a carpet fitter, people would ask if we could just carpet over the outlet on the stair riser that was ok to bury because they'd used filler on the holes...
Or the 'can you bury this length of zip wire under the carpet [usually 0.25mm sq, or around 20AWG].. we're planning to install a socket on that wall for the computer."
[frank confession]
I am afraid I'd lie to them (with the best motives). I'd relate the story of the house that burned down as a result of that kind of event. Yes it's happened, but I hadn't seen it first hand, I am sure many others on this board have though, but relating it in the first person usually changed their minds. In any case we'd refuse to put cables under the carpet, unless for speakers or telephone, and even then with the caveat 'it won't last'.
[/frank confession]