We're developing an electronic health record platform that stores data encrypted in a way that we don't have the decryption key. We don't have end-to-end encryption, but if you got a database dump then it'd be quite tricky to decrypt what's in it as data belonging to a person can be unlocked with a secret that the person has, and we don't; only in memory when serving the user.

So we're very far from perfect, but still better than most providers in this space. However, the fact that we can't easily do database migrations, debugging, etc makes our lives extremely hard, and it's much more difficult to compete in terms of UX.