Not putting in a 3.5mm jack says enough. They sell Bluetooth earbuds I wouldn't call that "fair". It leads to more landfill. Phones with 3.5mm jacks also have BT, and don't start about USBC singles, that's more to buy and more landfill when they inevitable break.
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.
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 don't know. It can definitely get enshittified by outside companies starting to spam advertisements, bringing a lot of work to the admins. It's probably best if it happened slowly so it can be dealt with in a structural manner, so I agree slow growth is healthier.
"the internet" is a necessity and requirement to function in society. You can't be denied access to it anymore, it would be disproportionate.