I have been looking at building a self hosted implementation of this service because of compliance reasons.
The $$$ of the service isn't the issue but making sure there is a good compliance option and self hosted to ensure that data doesn't leave boundaries and is stored securely on company servers.
If there was an option to have a paid self hosted option I would happily look at paying for that.
+1. Many companies have policies against the use of 3P cloud services, so Obsidian Sync is a non-starter in those cases, irrespective of the data being e2e encrypted.
Having a paid option where you can plug your own cloud storage (e.g. a Google drive folder, Dropbox, AWS, etc) would be fantastic. I'd gladly continue paying for my Sync subscription, but be able to point to my own cloud storage instead of Obsidian's servers.
But I understand you'd have to push the syncing logic to the client, and that is non-trivial. Alternatively, you could offer an official self-hosting server option, although it might not solve the issue for corporate users.
The $$$ of the service isn't the issue but making sure there is a good compliance option and self hosted to ensure that data doesn't leave boundaries and is stored securely on company servers.
If there was an option to have a paid self hosted option I would happily look at paying for that.