But perhaps you could do the monetisation via the sync service only and make the app open source :) That would be great, at least for me so I could compile it on FreeBSD. Some others do this, like Obsidian, for which there's an actual BSD port. But it's electron, sadly. But I understand... It's a tiny niche. I'll keep looking.
Of course I can't use flatpak and snap. And I can't stand snaps so no way I'd use that. Flatpaks are a bit better but not working on BSD.
I really used to love tomboy. It was fast, rich text, would automatically hyperlink notes together as you typed, it was so great. But they stopped development on it. There were a few reboots but they were complete rewrites and lacked all the speed and smoothness I loved.