If that would really be true than they wouldn't complain about being demonetized
But reddit is fundamentally built different than other social media platforms. Reddit is more like a collection of forums than a social media platform. The only thing that keeps people on reddit is the content and that can be moved.
On Youtube its the Algorithm and the Content Creators that keep people to use the platform. PeerTube and LBRY simply don't have the creators Youtube has.
On reddit people choose what to see. On YouTube the algorithm simply is wayy more important than on reddit.
They actually are in a position to do this.
Nobody is switching to let's say PeerTube because of something YouTube does as long as not every creator is switching too
PeerTube won't take off unlike Lemmy did and still does. People won't switch from YouTube to PeerTube because the creators they watch aren't there. Also the YouTube Algorithm is what people make use YouTube in the first place.
Reddit isn't creator based and doesn't necessarily need an Algorithm since the users choose what to see anyways. So the Lemmy experience isn't actually that mich worse than the reddit experience
There's The Pirate Bay, Zlib and a few i2p trackers. Probably a couple more. I don't know any other.
It is an app when you install it. There literally is no downside of using a PWA over a native app