Ask HN: How do you manage registration spam?

I can only assume the main intent is to find exploits with email and billing systems but there's a long list of other nefarious activity that could be at play.

I've set up a custom tool to monitor and prevent suspicious signups (looking at email deliverability, light identity checks and some AI with tuned prompts). Captchas don't seem to cut it as abusers don't seem to be bots.

Is this a problem other people are facing and if so how do you manage it, if at all?

Automatically delete verified accounts that have not made a purchase in the first month.

Automatically delete accounts that have not generated a "lead" in the first year.

Replace "lead" with whatever makes sense for your system.

Also maybe put Cloudflare WAF on your signup flow and set it to a high security level.

I routinely provide fake info when a website that I think MIGHT be something I am interested in, but refuses to give me enough info to know for sure, until I give them a bunch of personal info. NO THANKS!

Sometimes I tell them my name is Bob. I live at 123 Main St. My email is bob@nowhere.com. If that works to get me in the door, then I can look around to see if I want to become a real customer.