I would trust them more than Microsoft because at least they would actually store it encrypted safely and not just basic ACLs that are easy to bypass.
Even with a root shell on macOS you can't bypass certain things like access to the camera for example. You'd have to work way harder to access recall data, not in a way that malware can trivially access.
I still wouldn't use it though, because I think the whole thing is dumb and I don't need my computer to spy on me so I can remember what I did yesterday. I have browser/shell history for that.