Ring video doorbells do exist in Europe, but they're not very common. Apparently they are very common in the US, and they record video of things it sees. I think the legitimate use-case is to record if your packages (that are left by the door) are tampered with or stolen.

Here's an article: https://www.eff.org/deeplinks/2025/07/amazon-ring-cashes-techno-authoritarianism-and-mass-surveillance