I've worked in environments the USA where during the NBA "March Madness" tournament and NFL draft season, users accessing websites related to those events consumed an inordinate amount of the available bandwidth causing a negative impact on all other traffic. We had to amend the technology use policy and restrict access to sports content to make sure work could continue efficiently.
eduroam SPs [Service providers] are based on SP local policies. However, modifying the content of user connections (e.g., access lists or firewall filter rules to deny arbitrary ports or application-layer proxies) is strongly discouraged and MUST be reported to the respective RO [Roaming operator, the country-level Eduroam authorities].