When Musk bought Twitter there was talk of cross-platform communication. In other words link your Twitter account with Truth, Fakebook, Instagram, etc.
It would make sense for everyone.
Why would any counterparty do that? And Truth Social exists only because of President trump’s exile from Twitter. If at this point he agreed to post for subscribers on other platforms it would be a death knell for Trump Media. His exclusivity on it is the only reason it exists.