On top of what the other comments said, they did facial recognition with tracking. They created an id that was attached to a certain person. When the unit was reset, the same id was applied. People didn’t know this happened, because supposedly nothing went to the cloud or something.

https://www.theregister.com/2023/03/17/eufy_lawsuit/

I have a Reolink that is completely offline, but they also are under scrutiny for having Chinese backdoors in their newest models.

An other alternative is Ubiquity, but they are expensive. They used to have a completely offline offering, but I started looking at Reolink because Ubiquity started with cloud logins. Things may have changed, so look up more recent, non anecdotal, information.

I think it simply promotes other prime video content instead of product advertisement.

Joey was the superior app. Shame it didn’t get as widespread as the others.