Dark_Arc , 2 months ago

Proton is a greedy company that doesn’t like interoperability and likes to add features designed in a way to keep people locked their Web UI and applications.

That's nonsense. Proton has built everything around PGP and allows uploading public keys for users not using Proton Mail so that you can messaging them with Proton's PGP system automatically.

https://proton.me/blog/openpgp-crypto-refresh

There's 0 vendor lock in (in the entire Proton ecosystem) and there's tons of open sourced code.