And yes, some quotes, references, or a modicum of argumentation around a divisive point of view is also a good idea.
I wanted to try Proton out when they were having a sale, but I could not complete the purchase because I was on Mullvad's VPN.
I created a ticket, and when they got back to me 5 days later, they told me to disconnect from the VPN to sign up for Proton.