Been using protonmail and their VPN for over a year. Some sites, like Brownells, detect foreign addresses and block access or refer you to their foreign sites. If a site won’t let you in, you can switch to a U.S. server for that site, or switch it off temporarily.
Gunbroker suspended my account when I signed in over the VPN. Not sure if it they detected the VPN or just the foreign IP address, but they didn’t like it and said the use of fake IP addresses was forboten on their site.
