Gab is doing perfectly fine. Nobody on GAB even heard of BlueSky, Nostr or Fediverse because they are perfectly happy being on GAB and don't want to be anywhere else. I don't know a single person who is on BlueSky but i have about 250 followers on GAB - real people, not bots.
Discussion
the only reason i don't like GAB is, well 2 reasons:
1 - Christians
and
2 - Boomers
if you're a Christian Boomer you do not need any social media site other than GAB full stop.
unfortunately here on NOSTR we are getting Christ Cucks through the Fediverse Portal. i used to think " well at least they are not boomers " but they are literally more retarded than boomers.