I suspect that whatever screen vision and window control API they're using is macOS only.

It would be nice if this and the main AI app were on the App Store, just for a little more assurance regarding privacy.

Not that sandboxed apps can't yoink your shit if they really wanted to, but it's a nice barrier to have.

> Step 4: Allow keychain access.

Uhmmm.. what?

most Silicon Valley developers are on macOS, it's easier for them to develop for it, test it, also they get a smaller audience of other developers on macOS that are more willing to pay.