Tech billionaires become billionaires because there is a lot of MONEY in tech, particularly if you can go public.
Donald Trump could make more in a week with his new project than he has made in most of the rest of his career.
And in the same sense that Michael Bloomberg felt no shame using his newspaper to push his (failed) candidacy, there is no reason Donald Trump could not leverage his platform in his bid for reelection, if our democracy (whatever is left of it) lasts that long.
What is certain is that there is a huge untapped market out there.
And my two cents with regard to whatever Facebook facsimile he creates, that he keep the convention of using real names. It is much easier finding people that way, if they are a couple degrees of separation away.