The problem that is not being missed in the conversation about the technology is: who gets to decide who is excluded, how transparent to the need to be about this decision making process, and what is the course of appeals. Obviously the instance where MSG silently black-listed the lawyers representing their opponents in a court case is an obvious abuse that needs to be curbed.

I would propose that there be tiers: smaller venues only get dinged when their behavior is obviously bad (no need for formal systems, let people sue if it becomes a problem), mid tier need to post their rules, and large companies are subject to audits and formal rules about when they are allowed to blacklist people.