Not from me. I personally don't need Dropbox but I can see the utility if a company want to share a 1 TB storage area between employees. I'm guessing that's how it's used since I've never used it.
I took a look in my note taking bookmarks folder to see what I meant. I thought Obsidian was open source but it's not. I was thinking of Joplin, which I haven't tried yet, but will today
Joplin is excellent. I'm a very happy user. But I also use my own WebDAV server to sync. It would be nice if they supported Seafile as a sync target, but they do currently support Nextcloud.
I took a look in my note taking bookmarks folder to see what I meant. I thought Obsidian was open source but it's not. I was thinking of Joplin, which I haven't tried yet, but will today
https://joplinapp.org/