It's worth whatever someone will pay for it, in principle.
I guess using a SPAC gets around the need to find a bank willing to go on public record as running the placement, and might also avoid any public scrutiny of audited accounts until after he's cashed out.
Trump has some money coming to him it seems. A pump and dump. I imagine a lot of his supporters are going to lose a lot of money here.
https://www.theguardian.com/us-news/2024/mar/21/donald-trump-wealth-to-rise-by-more-than-3bn-if-shareholders-back-plan