My local bar has over a half dozen cameras pointed to customers and workers areas. I installed them plus the DVR at owner request, they're perfectly visible and nobody gives a damn (except a couple customers once asking if the devices were also listening and recording audio). Everyone knows the owner doesn't use the data for anything illegal, and one time thanks to cameras we caught a worker who stole food bags to use or sell them elsewhere. Trust does also play a role here.
You mean everyone assumes he doesn't abuse the data. That's different than knowing. It's just the lazy and thoughtless stance to take. "Why would they be allowed to have the cameras if they were up to no good"? Businesses are assumed to do no wrong and meet some high moral standard because it's easy to.
I also used not to care, because I used to think that "I don't put that much information on it".
But it always said data, but not which data, now I know it buys data from other to cross it, don't know which data they buy and don't know what kind of information they are able to get when they do this.
This is what we are only now understanding that they are doing and what is possible to do with this.
And of course, Facebook say the least minimum necessary to keep profiting with no problems. Hence I don't see how we can expect people to really know what Facebook does.