Longtime joplin user here - been using s3 sync storage since it was available. As long as it is open and free, that will be my note app of choice. Yeah the mobile app definitely needs work, and there's always room for improvement overall. But it is free as in "free beer", as well as "free speech". Both are hard requirements for me, at least for my notes (and data, in general).

I have years of notes in joplin, spread across dozens of notebooks and several profiles. I'm impressed.

There are a zillion competitors out there, some with extremely beautiful interfaces - but it MUST be open for me to even look at it.