Public web form (unique for every pm user) to let non-protonmail-users send us encrypted mails
Let non-protonmail-users send an encrypted email to a pm user using a unique public web form which uses that pm user private key to encrypt the data.
This way we can give people unfamiliar with PGP an easy way to communicate with us securely.
This is an idea borrowed from a very usefull feature of flowcrypt. Every flowcrypt user has a public form: https://flowcrypt.com/me/<USERNAME>. From there anybody can sendme an encrypted mail using my own public key with no need to share it and to instruct them how to use it.
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Christophe DAVID commented
As Protonmail users have a PGP key pair, why not have a web page like FlowCrypt offers that would allow anyone without a Protonmail account to send encrypted messages to Protonmail users ?