Unifi Protect is what runs on the CloudKey/NVR physical device - you don’t need to have it go through to the Internet.
Remember, for better or worse Ubiquiti is positioning themselves as SMB Enterprise security - some companies won’t want their footage to be accessible outside their network.
This is maybe controversial, but I love the Ubiquiti security stuff. Cameras (interior and exterior) doorbells, etc, it’s all great. Pricey, but you get what you pay for.
And the data can stay local or be accessible via their services.
I chose to go local only, grabbed their UNVR and populated it with 4x 2TB drives and it has enough space to handle 7 cameras HD history for about a month.
I’d be happy with just installing full blown Linux on my pixel a la graphene.
Surely this Pixel 7 Pro has enough oomph to do some of my games.