Yesterday Facebook took down all crypto-gambling adverts. There is a duty of care to not be the company responsible for making your customers crypto bag-holders. The gig is up with crypto in its current scam incarnation.
Are you saying that Facebook is responsible to make decisions for us - because all it takes is one advertisement to override the average human's discipline and self control?
The advertisements are just what they sell. As the platform owners, they can do a lot more in terms of information curation.
Facebook taking down cryptocurrency gambling ads is much different than Apple removing a general purpose instant messenger. You're finding a connection you want to find, I'm guessing based on your knowledge of PnD groups being on Telegram, that being your sole exposure to Telegram, and your opinion on cryptocurrency.
Apple is very conservative with adult content which I consider the far more likely reason, be that buggy image search, some kind of trending view that porn snuck into, that kind of thing.