Social networks are not always about how many people use them, but more specifically *who* uses them.
Twitter itself was never that popular compared to Facebook.
It always had an outsized influence on public culture due to who used it.
Well, now tech people and academics have migrated over to the Fediverse.
Which means that if you want to talk to tech people and academics, you have to figure out how to use it.
For many people, the Fediverse is becoming critical for work.