Thats a really good point. I'm working through this space right now so I'm kind of myopic to stuff like this.

I use a self hosted VPN (digiOcean); but under duress, I'd be a jerk to me. tbh; most sites are, lol. I've given up youtube and google because I am reCaptcha'd to death...

To your actual point, I don't think it would be a deal killer per se in implementation. Weirdo@Weirdo.com isn't blocked because they show up in troys list of known emails.

Fakebook@Weirdo.com is suspicious in this model because it has not been seen before.