Comment by marcinzm

I find authentication the least problematic place where risk based on ip is used. Etsy, for example, will suspend your seller account if it sees too many logins from different IPs or if it's from an IP it has flagged before. It also has terrible seller customer service so it could take weeks to get it un-suspended. Heard of some people using Private Relay getting hit by this during the beta so hopefully Etsy gets rid of that system.