Looking at areas I'm familiar with this is picking up a ton of non-fixed APs - in fact more mobile than fixed. Guessing that's cellphones with tethering on?
If you want to be excluded from this - as well as from: Google, Microsoft, Apple lists- you have to add ‘_nomap’ to the end of your wifi name.
Man - I loved this "back-in-the-day", uh... 23-years ago...
Thank you for sharing. Didn't knew it.
A similar project that also tracks cell towers and bluetooth beacons in addition to WiFi is https://beacondb.net . Since Mozilla Location Services shut down they have been a good alternative for geolocation and they are public domain. Unfortunately, data dumps are currently not available, though.