Concertgoer Bill of Rights - get bumped? Massive stipend, hotel room, free VIP ticket in future, & transportation+entry to a partner venue in the city with other music.
They haven’t all universally built in overbooking as a critical part of their competitive price structure or whatever, and we can stop it before it starts.
I still appreciate your point here too though; when I'm concerned about a hypothetical change in a system ending up negative in the long run, failing to account for existing precedents for mitigation is something I want to be corrected on