The videos being paid is not YT's choice, the channel owner must've set that specifically on those ranks for those videos.
Being visible despite being unavailable, seen 4149743 times before, plain crap, obvious junk with 45 views on a 2 sub channel, already specifically hidden, already specifically blocked, etc. etc etc etc etc... those are definitely Youtube though.
BlockTube may have a feature for this, it addresses some of those other cases. Or you could potentially hack together a uBlock rule for it ("any video on the front page that has this stupid price tag thing")
Pro tip: whenever someone asks you if you have a source and you say either "common sense" or "go find out", you have just said "no I don't."