TL;DR: Reddit is removing the option to opt out of ad personalization, targeting ads based on user activity. Some specific ad categories can still be limited, but there’s no more opt-out option.
For a doorbell, get one that can work entirely locally, ideally that supports ONVIF for the video feed, and use it with Home Assistant.
I don’t have a fancy doorbell, but I use Blue Iris, Home Assistant and Node-RED for my security cameras. Works well, including notifications when a person is detected, and everything is local. When I want to watch the cameras remotely, I connect to a VPN into my home.