Also, the fact that as far as I know Trump still hasn't posted anything there is a major unforced error. If nothing else it was a way to get a direct line to him post Twitter ban.
However it seems like the problem is scaling / delivering in a technical sense.
I find that incredible given the momentum he had just after election and the fact that the project was valued at 3 b usd via a spac.
There's another flip-side to this which is particularly important towards the more extreme end of the right wing - some people want to go where their enemies are. That Twitter allows you to jump right into the middle of a discussion and directly engage with or antagonise those who you dislike is a big draw. For those into reactionary politics, being siloed away in a little safe zone with people who agree with them isn't particularly gratifying.
edit: I agree with your comment btw, I just wanted to add a little something to it :D