Years ago there was PirateBox: flash a small Wifi access point with a custom firmware that's a webserver that hosts a forum/filehost. Their website is dead, but here's a mod of the project; https://www.jasongriffey.net/librarybox/
Although, I dread to think what sort of files one would get when user uploads are allowed.
I built a PirateBox with an old Asus access point once. It was a bit of a dissapointing experience. Mostly because people were scared to access an open wifi point. Plus it did not 'give one free internet' so people usually immediately disconnected. Unfortunately the Library Box mod is also no longer an active project.
I had the same experience. I ran it on the original Pi zero with a WiFi dongle, in the middle of a busy town. Not a single interaction.