I think he's corrupt. The Trump coin scam stinks to high heaven, and it's not the only thing. But I have trouble seeing him being able to pull off that degree of corruption and profit in that amount of time.
If he just takes it by executive fiat, there's no way that will stand. This is still to at least some degree a nation with the rule of law, and that would be entirely contrary to law. (Even if you claim that oligarchs actually are what rule the country, the current system is that those oligarchs do so through using the law and the courts. They don't want that thrown away, because they would actually lose power by doing so.)
But if OpenAI "gives" it to Trump "voluntarily", then every competitor of OpenAI now has grounds to tie up every federal use of OpenAI in court, claiming anti-competitive conduct.
So, no, I don't see that happening.