The "best" is when you can't even sign up without having an account at a Large Company e.g. gmail or outlook. I'm not sure what that's supposed to prevent issues with.
Sure, you can add "+thing" after the username portion, but those that know this bog standard trick can still automatically derive your email address and get around your filters. At least with a dedicated username portion a human has to think for a second.
Sure, you can add "+thing" after the username portion, but those that know this bog standard trick can still automatically derive your email address and get around your filters. At least with a dedicated username portion a human has to think for a second.