[A_D_E_P_T]

There's room for one with better privacy and, hopefully, E2EE -- if you can find a way to make it work.

There was a thread about this just a couple of weeks ago: https://news.ycombinator.com/item?id=40924055

Protonmail is increasingly Gmail-like in every respect -- with its AI "tools," with it asking you for personal information upon account setup, and in obliging cooperation with foreign courts -- so a new service which doesn't deviate from a focus on true privacy would rapidly find its niche.