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 ne

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.