i'm not exactly sure how it works, but i'm betting that his decision to run/not run is entirely financial...
if he runs, the RNC quits covering his legal bills. there are no restrictions on what trump does with his pac money, until he declares.
but...that money can't be used for a new campaign. he's have to start collecting again, and frankly, he's already bled his stupider supporters white, and the big money people wouldn't give him a dime after all of his fuckups and stupidity.
https://www.npr.org/2022/08/24/1118946905/trump-pac-money-fec