This seems like a relatively easy problem to mitigate: just put some local storage in the camera (even 1TB microSD cards cost very little). When the Wi-Fi is out, simply record to local storage. When it's restored, upload the recorded footage.
Indeed a quick search shows that newer Google Nest cameras support recording for an hour during Wi-Fi outage: https://store.google.com/magazine/compare_cameras?hl=en-US I'm surprised that Ring doesn't have something equivalent.