Syncthing?

There is also Borg but I think it doesn’t have the features you’re looking for such as incremental backups and two-way sync etc.

The author is talking about the server use-case here but it’s not any better for desktops either. I think it boils down to the fact that neither of these operating systems are designed for a single-user world like Android (or any other modern mobile OS) and so these security solutions are shoehorned into a world where they don’t really fit into. Because those (server or desktop) programmes have different set of expectations about what’s available to them, than say, an Android app that knows that it has to ask for permission first.

ActivityPub :) People spend an incredible amount of time on social media—whether it be Facebook, Instagram, Twitter/X, TikTok, and YouTube—so it’d be nice to liberate that.

OpenAI

I think OpenAI has always been a for-profit private company despite its name.