I believe one big anti-incentive is rate limiting, especially nowadays. With IPv4 getting a range ban is somewhat effective, way less effective on ipv6 (theres a reason HE tunnelbroker is marked bad nowadays, discord bots doing music load balance over ips on tunnelbroker for pulling youtube audio data.. they ban a /64 but you balance over a /48 or bigger). I believe this was the main reason Discord disabled IPv6 (not sure if thats still the case, but it was back in the day since bans and api rate limiting was ip based).