Also lots of those "upgrades" are things that wouldn't have happened at all, if it weren't for a video. And seeing how much fun the workers have in those videos, I find it quite unlikely that they feel insulted doing them.
Also, did we forget that the ultimate tech upgrade is a thing? The series where the workers get quite beefy upgrades to their very own homes, and it's not even limited to pc's. Linus even personally painted at least a couple of the workers walls lol, so I'm pretty sure "the workers being held as peasants" is quite far from the truth.