He saw the politics of it after trying to get real discovery in the case. They won’t open the files, so he refuses to cooperate.
I doubt politics had anything to do with his reversal, coming as it does the day after Devin Nunes’ new gig is announced.
Trump Media offers a big money option for those who remain loyal. That’s never existed before, Rush, Hannity, et al made millions but they kept it all for themselves. Trump Media holds the potential to create the “Trump Institute for Advanced MAGA Studies” and there will be plenty of money to spread around once he monetizes what he was giving away for free on Twitter.