LOL, I was a forum mod over on Ultimate-Guitar many many years ago (at age 17), and in extreme situations IP bans were used. Sure, people can get around them if they wish to, but ultimately the fight against spammers and scammers alike comes down to making it inconvenient for them to operate on your platform. If someone got caught in the cross-fire, they could still make an appeal in what was called the 'forum of the banned'. Far from a perfect solution, but we're talking almost 20 years ago. Get a grip, please โ you're not performing brain surgery from your cosy WfH desk.