Games like Among Us, RV There Yet, Peak, Lethal Company, etc. I don't mind them so long as there's no woke elements to them, though I've never actually played any of them myself. I have two groups of streamers that I like (Fooster/Fisk/Olafpawbelt and Splitsie/Capac/TFE/Shack) that play them from time to time and it's pretty enjoyable watching them. These sorts of games strike me as games that are more meant to be watched than played yourself. I doubt many of them sell that many units, and they typically are only popular for a couple of weeks before being replaced by the next one.
I bet a lot of copies sold are people who think 'oh man, this looked like fun when I saw $streamer play it, I can't wait to play it with my friends' and then they never do. They seem to be pretty cheap, so if an indie dev can provide a few weeks of enjoyment for $9.99, honestly there are worse ripoffs in the gaming world.
They feel like the equivalent of pulp media from generations past. Low quality stuff that's generally enjoyable but not something you'll invest much time or effort into before moving on. Many of them are free to play in order to lower the barrier to entry, which makes it pretty easy to grab your friends and just jump in for a night or two before moving on. There's really only so much you can realistically get out of something like Supermarket Together before the novelty wears off and many of these games can't sustain themselves beyond that novelty.
Maybe that's what it is, just a byproduct of our ever dwindling attention spans. We constantly crave novelty and these games provide just enough of it to sustain that habit.
I'm not terribly well attuned to the genre but my suspicion is that many of them are comparably lower effort to produce than other genres, which plays into my modern pulp media theory. Like really, just how many man hours do we think went into creating Cheese Rolling vs any given indie platformer?