If Ticketmaster wants to know I'm not a bot, I guess I would be OK signing a challenge with my government issued identity card [0] - for message boards that need to avoid spam and griefers, IMO an invite only system with revokable access to everyone a bad actor handed an invite code could be sufficient

Also scanning my eyeballs to have a private corporation give the thumbs up or thumbs down on whether I can access a particular service isnt merely distasteful but dystopian in a "we already lost" kind of way

[0] https://en.m.wikipedia.org/wiki/Estonian_identity_card