I am subscribed to ~270 channels through newpipe and I get "failed to fetch subscription" like maybe once a month only to see the channel is dead (usually temporarily). If you are just using youtube's app directly you won't notice when they get delisted.

I just scrolled through my subscriptions and it's mostly music, comedy, gaming, entertainment, and science channels.

I always assume it is for DMCA or for saying curse words. Every once and a while it will be because they said something politically incorrect or used the wrong chemicals or showed a gun or something.

I think that pretty much anything except for porn and gore should be allowed. I am just scrolling and I think that this video is a good example of a vid that only lasts about a month on the site, even though it should be allowed:

https://www.youtube.com/watch?v=H1B_EdVnKFg

It has "guns", it has "drugs", it has political figures, and it has minecraft so therefore it must qualify as a children's video. This channel is basically a magnet for getting wrongfully demonetized and banned by AI or some guy working in an indian call center. But 12 years ago this would be a normal video.

Another example I can think of is "youtube poops" which are unconventional mashups of copyrighted content. They constantly get taken down and need to be reuploaded:

https://www.youtube.com/watch?v=XwgPraTb_64

I wonder about the influence of the language. I regularly watch videos in English, Spanish (my mother language), and Japanese (my girlfriend's language).

English-speaking channels are usually more "polite" in the way they speak, while Spanish-speaking channels are way crazier, using expressions that no American would dare to use xD

Regarding Japanese, I don't understand enough to have a judgement, but Japanese people are usually very careful and non-confrontational.