Some (maybe most or all) of these devices require an external service to be used. That means it will work as longs as the service exists. You are in the hands of the vendor. My dream is to make devices like this and make them remotely accessible through Tor; that way it can be fully local but remotely accessible from anywhere in the world.
I bought a few Reolink cameras (around $50 each) and they have pan/tilt and don't require the internet. In fact, I didn't even connect them to it, I connect to them via my Tailscale VPN and they support this mode explicitly, and work perfectly (obviously real-time notifications don't work).
