Please add support for Monero.

XMR has ring signatures and stealth addresses and will soon have Confidential Transactions, all enforced across the network! This will effectively hide source, destination and amount and will result in a neutral financial network wich is resistant to geopolitical manipulation, coercion and censorship... Imho every privacy-focused service should use monero as a payment-option!!!

@Brad Monero is not "some small alt-coin" It has more support from prominent Bitcoin personalities than any other privacy crypto-currency. Soon it will join Ethereum and Bitcoin as the 3rd cryptocurrency on StackExchange.
https://lab.getmonero.org/pubs/MRL-0005.pdf
https://www.reddit.com/r/Monero/comments/46gfgv/list_of_prominent_bitcoin_people_that_spoke/

A vendor like Protonmail should not have to support some small alt-coin like Monero. That should outsourced to some payment gateway. It makes no sense when the amount of people who own Monero is so tiny.

Please accept Monero far more private than Bitcoin. Since I use Proton mail this would be helpful.

For maximum privacy Monero payments are far superior to Bitcoin

Those that value email privacy will appreciate the chance to pay Protonmail privately with Monero. Expect many upgrades from Monero users once this option is added.

Private email deserves a private payment option. Monero is the best option on the market.

Please accept Monero payments for Protonmail Plus and Visionary upgrades. Monero (XMR) is the most secure, private and untraceable currency available today. Many Monero users are longtime supporters of ProtonMail and would like payment privacy when upgrading their email account or making a donations.