And this might actually get me to use Proton. I'm currently with Tuta, and the experience there is... just okay. I went with them because they claim to have even less access to my stuff vs Proton, and Proton being private didn't get me to trust them enough to use them instead (I've used them in the past though). But this structural change might convince me that they're trustworthy enough to switch to.
We'll see how it turns out. I'm still giving Tuta a shot because I like the idea of not bundling everything together, but once I get my NextCloud setup working, I'll decide how much of Proton I'll actually need, compare prices, etc.