Like ProtonMail, it would likely attract more people who'd choose to pay for a VPN plan (including myself) if there was a tiered VPN pricing plan coupled with the ProtonMail plan (e.g. a ProtonMail + VPN plan with access to 1-3 servers vs. access to all servers available). One that you can pay less per month than the full VPN + Mail plan (7.99€), but more than the ProtonMail stand-alone plan (3.29€). A plan where you get to choose 3 specific country VPN servers that you have access to, instead of a plan that allows all the countries available.

To pay 4.70€ extra just to add a whole bunch of servers you'll never use seems excessive and definitely has made me reconsider adding the paid Proton VPN access.