I am unable to accept that it is fully local, since you have to bind your network to their cloud just to accept the EULA. [0] I have 0% trust that a subsequent unbind truly severs the link, because this is such a shady thing to require in the first place.
[0] https://community.ui.com/questions/e3d50641-5c00-4607-9723-4...
So once you accept the EULA, it's fully local. What's your problem with that ?
I'm surprised this is required. Agreed that's shady. I wonder what their reasoning is.
But if you don't trust it, the fix is easy: just deny the Ubiquiti cameras and controller all internet access. That way no trust is required.