A CCTV setup likely won’t work for people who just want a video doorbell.
But replacing a Ring with something like a Reolink means they can start with the same service, and over time move to RTSP and a local server as they become more aware of privacy implications and are driven to invest in a contained system.
Likely people will never go CC though, as the entire point for most people is to see what shows up at their door when they’re not at home.