The main draw for Truth Social is not posting on it. If he was "truthing" 50 times a day, they would be doing a lot better.
I suspect some negotiation is going on. The main content creator wants a bigger slice of the business.
Trump never posting on TruthSocial seems to be a pretty low commitment from him. Or maybe he sent a welcome/test message. Meanwhile, he doesn't even have someone crossload his blog entries.