Standalone VPN addon
Make it possible to add just the VPN subscription to a user account as an addon – a separate subscription from the main proton.me a subscription.
Users with free accounts who only want VPN would be able to pay just for the VPN and not for additional mail and drive features they do not need.
In organisations (or possibly in the future, Families) administrators could add VPN subscriptions only to certain accounts, without the need to switch the entire org/family to a higher subscription tier.
Users who only require premium VPN service for shorter periods of time (travellers) would be able to activate it and cancel it without the need to move their entire account to a higher tier subscription.