In my building, some apartments just couldn't afford to do this. At the time, I was able to chip in, but lately I've been pretty broke so I wouldn't be able to afford it right now.

FYI, this is not just painted, this is paint over insulation for the apartment. Should keep things warmer in winter and colder in summer.

This is an ad? Holy fuck. Is this the future with AI. We get shitty subliminal ads instead of content? I'd much rather have my head bashed in by some robot.

But the one that hasn't paid does not have the same amount of external insulation. See the thickness of "paint", it's not just paint, it's insulation layer commonly used to improve thermal efficiency of a building.

Still, he'll benefit from heat raising from the apartment below, it's those above him that are worse off because the heat will escape through his walls.