I feel no real need to join the platforms tbh. Yeah, the platforms are easier, but that's to be expected, addictive fast-food is also easier. "Slow computing" takes some effort, and is not for everyone. But it's there for anyone seeking it out.
I'm on Matrix, run NextCloud, use Podverse for podcasts. Anyone can do that (well maybe NextCloud is bit on the technical side).
There was a brief moment ten years ago when XMPP ruled the world. Matrix sucks.
You're buying flexibility and freedom in exchange for complexity and service degradation.
If you think that stuff is worth it, you have to conclude it's like vegetables: they're healthier, but no one will want to eat them, even the people who realize they're heathier. :p
I come from a culture of: Boil you veggies to death, squash with potatoes, eat (most taste comes from the meat presented on the side). This can be delicious if the veggie is kale, the potatoes are squashed with butter, you add bacon baked in wine vinegar and honey, and eat it with some mustard. But generally the taste is boiled away. But, if you take your chicory for example, fry it, then add some orange juice, steam it a bit, make it into a "tarte tartin" with goat cheese, rocket and sun dried tomatoes on top... That's a new world.
Well, all the powerful entities in IT are.
Most people are on Android, that is technically Linux but not open by any standard. Most others are on iOS, that is even less open, besides technically being BSD.
Most of the ones trying to get an open platform to do something useful are stuck on Windows, and completely under the whims of a few powerful players.