The latest Raspberry Pi cameras have decent sensors, variants with night vision are available. Axis makes reliable, network attached cameras.

Open-source software like Frigate or ZoneMinder exists.

https://github.com/blakeblackshear/frigate

https://github.com/ZoneMinder/zoneminder

Still, would you really want that? A half-baked device in your network, a device you suspect would constantly betray you, if given the chance?

I personally can’t imagine getting used to that. I’d despise the device (and myself probably).