I just had a look at Gettr, the one setup by Jason Miller (Trump's former something-or-other who had an affair while he was married, resulting in the birth of two children near the same time). I thought he would have tonnes of followers, given this has been running for some time now:

https://gettr.com/user/jasonmillerindc

(very Twitter-like user interface) - and he's not even on 1 million, even as the founder!

Edit: numbers not much better for his Twitter profile, which he's had for almost 10 years: https://twitter.com/JasonMillerinDC

If the founder can't get a million, Trump (who I don't believe is on this Gettr thing) probably won't be enjoying the 81 million on his own platform, that he had before Twitter shut him down. But as I say, let's see what happens.