[crispinb]

I think the very fact that there are 'dozens' is part of the problem. Avid or consistent note-takers (like me!) are getting tired of having their notes stranded on platforms that go out of business, or go stale, or turn in directions the user doesn't like. There are usually export functions available, but they nearly always lack fidelity somewhere (metadata, or notebook structure, etc).

For this reason, having used many different systems over the years, I won't ever again use an online notes-island not under my control. I think this is why when this comes up, so many people respond with "markdown!", "org-mode!" etc. These can be invested in without the stranding risk.