Once again, not true. It is enforceable, if it is within the contract.
You’ve now pivoted to saying “they can’t put it in the purchase agreement”, which is NOT true.
You are correct in the sense that new ownership *could* make a case and not sign the agreement. At which point, I believe, they would walk away from the offer entirely. The Blazers were the equivalent to Paul Allen’s child, per conversations with the man himself.
The lack of guarantee to leave the Blazers in Portland is, in my opinion, a non-starter due to this. The offer wouldn’t even be looked at. Much like offering Meyers Leonard for LeBron, they would go “uhh, you can’t even meet the first basic stipulation of the sale terms,,, leave the Blazers in PDX” and they would hang up.
Look at some of Paul Allen’s investments in tech companies if you don’t believe the power of contracts (and having massive legal teams) and leverage.
You can put a billion stupid, silly, petty things within a contract. If it’s agreed to, no matter how much it may stifle competition, it’s enforceable.