What would happen if you configured manual network and gave it a fake DNS or sent it over to PiHole for example? Wouldnt there be plenty of ways to capture the traffic and stop it from going where it wants to go? I would think the tech savvy folks on this site would be able to figure something out if it is a big enough concern of theirs.

I have not come across a working password free residential wifi hotspot in almost a decade - because routers have had passwords by default.

I live in an apartment building downtown adjacent to other buildings. They are all around me.

My observation is the open wifi's are much more prevalent in dense living situations like apartments, condos, townhomes, and shared work spaces.