I knew a guy who basically got internet access at his apartment in college via his local DOT. The message signs on the boulevard he worked on were just cellular mifi units with open or default credentials. Not super fast, but the price was right.
I once got a few years of free broadband Internet because I signed up for broadband plus basic cable, but they never put broadband on my bill. They came and did the installation and everything. Then when it eventually shut off, I called them back to complain and they said they had no record of me being a broadband customer, so I was able to sign up for the lower new customer rate.
At the same time, my TV had a built in digital tuner that could tune into the on-demand streams of other people in my neighborhood. I could watch as the paused/rewind/etc. The watching trends were interesting. Late nights you'd see soft-core adult movies, Saturday mornings you'd see lots of kid's shows.
That's more clever than my reuse story. I repurposed an outdoor AP into a client bridge and pointed at the nearby walmart. I had it feeding an unlocked AP and a yagi pointing into the neighborhood.
I ran it for a year without getting my door kicked in.
I’m skeptical an arrangement like this could work. The authentication mechanism would be interesting enough to attract security researchers and likely open anonymous Internet access that may undermine any potential benefit gained from viewer data. I could be wrong but I hope not.