Now @gruber may say, "Mastodon is the 800 lb. gorilla in the Fediverse ecosystem."
Maybe, but it's nowhere near as dominant as many believe.
According do fediverse.oberserver, there are 21,723 Fediverse instances -- of which there are 11,944 instances.
That means there are 9,779 instances that are *not* Mastodon.
By ignoring all those non-Mastodon instances, 3rd party client devs are ignoring a huge amount of potential in the Fediverse.
Further devs like @gruber over-estimate the dominance of Mastodon.
Certainly, in terms of the Fediverse, Mastodon is huge.
But PeerTube and Pixelfed are nothing to sneeze at either.
PeerTube has 306,337 users. That's not as many as Mastodon.
But PeerTube's userbase isn't anything to sneeze at either.
What's more, just like Mastodon, PeerTube could grow. Especially if a black swan event happens with YouTube -- which is feasible!