Did you even bother to read about how it works or did you just skip straight to the hysteria? Proton Scribe runs locally on the device and it does not use your inputs for training. No data is sent to the cloud or third-parties.
In which case it runs on no-log servers. Support is coming for other browsers and the Proton Mail desktop app is already supported on macOS. Of course, all of this ignores the even greater point that this is an entirely optional feature that no one has to use. Personally I will be ignoring it completely.
No, the point is in having a for profit org and something like the blender foundation. It's about trust, not just the crappy llm thing, about the thing where they say everybody wants this