I guess, but not all app stores have the same restrictions… And there are open source ways of doing this, software anyway, maybe not with hardware.

Simple Google search of the original question, because I want to do the same thing, or at least self host a home security system.

Is this a AI repost from reddit bot?

https://old.reddit.com/r/homeautomation/comments/mytf8f/open_source_options_for_doorbell_camera/gvxbs9j/