Alternatively, the Reolink Doorbell cameras for anyone who doesn't want to be on the Unifi/Ubiquiti platform. Also I believe all these cameras provide a generic RTSP feed which can be consumed by any computer running Frigate[0], an open-source NVR/AI platform.
If it matters to you, Reolink is a Chinese owned company. Not passing judgement one way or another, but if avoiding Unifi over the remote incident matters, I could see this factoring in as well.
Separate vlans for iot devices with strict firewall rules is generally enough to mitigate the threat of most iot devices phoning home i think. We’re already in the territory of hobbyists who should be able to manage that with these suggestions like ubiquity and frigate.
0: https://frigate.video
(Reolink, Unifi/Ubiquiti, and Frigate are all good solutions for anyone who is not interested in supporting the proliferation of a police-state)