It's quite likely that some of these networks already had existing infrastructure used for something else (e.g. local free Wi-Fi under a different SSID, or a network used for some other non-public purpose), in which case 80 hotspots (probably meaning single access points?) would really not be unusual.

I've seen this happen in some airports or even entire cities that broadcast the Eduroam SSID as well. Most curiously, I've seen at least one drink vending machine in Japan broadcasting functional Eduroam.

Maybe it's just not adopted in your city yet?

> Connect to over 93 000 hotspots across the EU:

Looking at a few spots around me, it seems it includes some hotspots in public buildings and museums and so on. So on the map it shows e.g. 30 hotspots in a museum, which seems OK as you probably need that many for coverage indoors with the amount of people typically there.