Warn user about adding a card payment option if they have ProtonVPN on
When user adds a card payment option, they are most likely redirected to their bank's web service to verify the action. Many banks have strict automated monitoring that may lock the card when an action seems suspicious.
Using a VPN may trigger such lock on the bank's side for various reasons.
For a real-life example, your VPN might be using a server located in different region than your real region and the verification process may require you to use another device (like your phone) which might not be using a VPN. On bank's side, this may look like someone is adding a card from region X, while confirming the action from region Y, looking suspicious enough for locking the card.
Unlocking the card depends solely on the bank and in bad cases it may take multiple days.
Understandably, Proton cannot know how each bank's verification process works, but Proton provides a VPN service and they could potentially reliably detect when user is using their VPN.
On the "add card" dialog, showing a warning "Looks like you are using ProtonVPN. Beware, that some banks may apply restrictions on cards due to VPN traffic", could help the user to weigh the situation before proceeding forward. For example, user could have forgotten their VPN on and unknowingly cause themselves trouble.
The warning could also alternatively be shown all the time without attempting to detect VPN usage: "If you are using a VPN. Beware, that..."
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Ket Bento commented
This is an important point regarding how using a VPN can impact bank verification processes, especially when it comes to security and fraud prevention. Having this kind of proactive warning can really help avoid complications for users.
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