Smart doorbells are the (currently) acceptible version of a constanly twitching lace curtain.
curtain twitcher
someone who is very interested in what their neighbours (= people who live near them) are doing and tries to find out by looking out of the window without being seen:
https://dictionary.cambridge.org/dictionary/english/curtain-...
The doorbell and security camera stuff do seem to be a cultural difference between the US and where I live though; I don’t have strangers routinely come to my front door and don’t really have security concerns that aren’t solved by locking my front door.
A couple of my friends have smart doorbells but none that I know of use security cameras at home.