> ads, propaganda and hate speech
Just think about this (which is not 100% correct, but for the sake of discussion): it's probably not meta, google and tiktok. It's the internet peoples who are the source of all that. It's peoples who say hate, who push for ideas they believe in, and they also (surprise!) publish ads! (While google et cetera are just a medium, with lots of moderation, yep.).
It's really the bots and algorithms are the source of all of that, promoting somebody's agenda. Now AI too. Remember, Tay the Microsoft bot that they put on Twitter and it became nazi the next day? It's that multiplied by the number of stars in the visible universe.
The only safer places are heavily moderated hobby related forums with actual people. Anti vaxxing is not a hobby btw.