At the risk of I told you so, it was always a stupid idea.
Any service like this that "requires the cloud," but is personal or individual and could be replaced by completely non-cloud software WILL go obsolete.
If you can use a basic hosting with backup features, you can simply use a $5 droplet to sync almost everything possibly you can think of. Or OneDrive / Google Drive if you are using Windows based applications with databases. It is really not that difficult to keep data safe and backed up.
Or much more convenient, given that the data is local and almost always available without the vagaries of an internet connection and remote server (except if/when all the bad local data loss scenarios happen at once and you need to restore from your cloud backup).
Maybe your circumstances are different but I find myself without any device capable of getting online at practically no time in a typical day, and in the few scenarios I do, keeping them on one device wouldn’t have helped.
It's so odd that comments like this actually still get made on Hacker News; this is SUCH a solved problem, and yet people still make it likely because it pays someones bills, despite being trivially easy to solve.
Any service like this that "requires the cloud," but is personal or individual and could be replaced by completely non-cloud software WILL go obsolete.
Obsidian, et al understand this.