Well, privacy is not binary. Nothing is ever fully public or fully private. Something being more or less private just describes how hard it is for someone to get this information. The inertia of this information.
Do they have to drive to your house to find out where they can break in or can they see from Google StreetView? Do they have to collect a whole bunch of phone books to find out your name+number or is it readily available in a dataset online? Can they just access your PC without hindrance or do they need to strap you to a torture rack to get your password out of you?
And just as well, information loses value over time. Either because it's not anymore correct / particularly relevant, or because it's covered up by more accessible information.
Why worry about fingerprinting one user's browser when billions of people don't even clear their cookies? Why sift through a data leak of 10000 people when a data leak with millions of people is just as well available? Why try to steal the identity of that guy who's data got leaked in one data leak, if there's this other guy with cross-referencable entries in 8 data leaks?
As such, it's still always going to be worth something to try to reduce your data footprint. If you're smarter about your data than most other people are, you'll stop being interesting to data brokers, because you're just too much effort.