There are multiple workarounds for YouTube ads like Revanced on Android for example. On Computer I didn't encounter any issues for using the uBlock Origin extension.
Nebula.tv has some promise. It's not free but it's very cheap and creator-owned. Plus there's no ads.
But it can never be a true replacement for Youtube because it doesn't allow just anyone to upload there.
Wouldn't exactly say fashisim is to blame but rather simply corpos want maximize profit on a hinherently unprofitable business models. Like I'm personally not seeing much ideology getting pushed anywhere. Granted I hardly spend time on Twitter but all I've been seein on x is furry tits and on the other platforms just ads getting pushed. From what I can tell you can say what ever and no one will hear you over the ads.
I have Twitter completely blocked, just from the news alone it's clear Elon is pushing a political agenda at the expense of the business, which means it's the intended point, because he's not dumb. It doesn't matter what you specifically would see in your timeline these days, assuming you would follow better-than-garbage people. The platform is directly being advertised to the world as a place for fascist ideology to go unchecked. The people that know that, and stay on the platform specifically for that reason, are following a very different set of accounts and they're getting a huge, daily dose of empowerment as Elon lets it flow freely, even engages in it regularly. Again, intentionally.
Conceptually I get what you're saying, but I've never used Twitter and I dropped Reddit in July cold turkey.
I have had no issues being where the people are just sticking to the Fediverse.
I don't feel like I've missed anything. I did pick up Mastodon, but that's just lurking. I picked up a few news apps to fill in a blank or two, but those usually end up on Lemmy anyway.