>OpenPGP uses a decentralized “Web of Trust” where users vouch for each other’s keys.
This article fails to mention WKD [1] (Web Key Directory) which is supported by Proton Mail, doesn't rely on the "Web of Trust" and allows seamless PGP encryption of sent emails. Here is an example of how this works (and how it can get annoying) [2].
[1] https://datatracker.ietf.org/doc/draft-koch-openpgp-webkey-s...