They (Proton) work for governments: CH, EU.

They've been working ca. 8 years to remove Google dependencies from thier source (Protonmail).

They've been working ca. 8 years to implement proxy option in Android app.

Do you think that they care about your security?

They collect tone of data and don't even tell how long they keep it (support).

In the meantime they introduce new products to bring you to their garden e.g. calendar, VPN, pass etc.

Evaluate it on your own.