Looks like an open version of SkyHook from way back in 2003: https://en.wikipedia.org/wiki/Skyhook_Wireless

For a while they had a paid program, I had a Windows Mobile app I could run with an external GPS dongle that would record wifi APs and location, upload to skyhook, who would occasionally cut me a check for my trouble. I made tens of dollars!

I started rotating my BSSID weekly after I learned Apple and Google abused it to track the location of people and devices.

Permanent hardware or software IDs, such as the Windows GUID or machine-id on Linux (systemd) are inevitably abused for surveillance sooner or later.

Interesting, wondering why Apple doesn't restrict the queries to its server using a certificate that would be pinned on the devices, etc, so at least you would need a legit iPhone/Mac to be able to do a query?

Cool. This'll go nicely with my hackslab and tinfoil hat upgrade.