Suspicious User Concerns
Last night my site received a sign-up from someone using a Proton email. The name in the email address didn't match the name they used on my site, their phone number contained an area code that does not exist, and they accessed us via VPN.
I canceled the account without notice because from what I know about the internet this is clearly some form of intended illegal activity.
How do I protect against this with introducing no additional friction to my legit customers?