There’s certainly a middle ground between IOT cameras sending a constant stream out to an internet server and a completely private circuit.

First, let’s put the NVR inside the network so that we aren’t constantly broadcasting to the internet.

Then let’s not allow direct access to the cameras from the internet. Instead, we connect to the NVR via a VPN.

You keep control of all the recording and storage infrastructure, and you don’t place your trust in these corporations that have been found over and over again to be lying or overstating their security stance.