Jeeze, it is the Wild West out there! The status of the game is chaotic with the portal and NIL, etc. No wonder that many old schoolers will want to check-out. Heck, even as a fan I'm not sure it is worth embracing.
I would expect the big time basketball factories - Duke, UNC, KY, L'ville, AZ as well as a handful of others that just have deep pockets due to football will likely have alumni spending alot of money while others get what they get.
I get Tshiebwe's decision. He isn't listed as being on many mock drafts despite being a college All-American. His game doesn't fit (or at least the scouts don't think it does) the modern NBA game. But he can stay at KY for another year and make more than he would by going to play overseas.
In this way, not only can a blue blood win the one-on-one wars, but they can also end up with the best of the 4-yr college standouts who will likely transfer to a blue blood - like Oscar did at KY, because they can offer a larger NIL package.