That... sounds pretty good! I generally wouldn't bet on a company doing the right thing, but Proton has been tempting in that regard. I found the Standard Notes acquisition distasteful at first, but just maybe everything will turn out great.
Standard Notes wants to charge you money to run open source JavaScript code, including other people's markdown and spreadsheet editors, on your own server. To do this, they go out of their way to make self-hosting harder.
Standard Notes went out of their way to make it harder to self-host extensions a couple years ago, which IMO was pretty tasteless on its own. Instead of letting you install a single bundle of extensions with one URL, you would have to manually add each extension and then manually update it later.
They opted for charging for other people's work. Their editor extensions were other people's work. For example, their rich text editor was somebody else's rich text editor with a thin wrapper that allowed it to run in Standard Notes. (Using so many other people's editors also led to a bit of a lack of stylistic direction.)
And then, more recently, they decided to shut off web app access to third-party servers entirely.
"FOSS" only means so much when they dictate what goes into the source code. Unfortunately.