This is the best rebuttal. I might change my opinion a little bit on this. But as a service that still passes data through someones centralized network, there is no real guarantee for full privacy. But it does look to be ran by a rockstar with a descent view on privacy first. So I will yield to signal.

The problem with proton is that centralized service. Proton has given up user data before and ideally if your trusting a platform for privacy reasons then you dont want them to have a mechanism for handing over your data. So proton is still a platform that needs work before it can be what it promises to be. That said it is probably still better than using non privacy centric services like gmail and so on.

Signal and any of the proton products dont belong in this list.