My car has an aux cable to connect to my phone. The cable died again so I’ve been rediscovering the radio and I’ve been been hearing commercials for whatsapp. They advertise E2EE as a feature. What you are saying is a contradiction to that. Is it possible to have E2EE AND have them sell your convo to third parties?
Reolink cameras look like they check all of your boxes. They can be self contained systems with a “recorder box” (actual term is NVR) that you keep on your property out of harms way or it can be a DIY PC with a program called Blue Iris. There is a variety of cameras to choose from with different features like Wifi, POE, PTZ, solar powered, etc. Spend as little or as much as you want. As you mentioned in your post, this will be pricey up front but will be cheaper in the long run.
So E2EE but they have a copy of the keys to use at their discretion. Cool, we have digital landlords now.
E2EE* plaintext with extra steps