I think they do but they use AT protocol (theirs) instead of ActivityPub so that's why you don't see them in mastodon and they don't have many servers in federation
That's definitely not true. We still don't have focus modes or widgets on lock screen or maybe 3rd party lock screens clocks or the ability to mute notifications on an app/channel or desktop mode.
Gift someone premium, do this and do that with premium, now there are some ads too etc