[civilitty]

RF spectrum is a limited and valuable public resource that’s rented out to licensed operators who use devices from licensed manufacturers. That’s the mechanism behind the emergency alert system in a legal and practical sense (in the US at least).

Applying that to browsers does seem unreasonable to me. IANAL but to my knowledge mobile OSs aren’t legally required to support the emergency alert features of the radio because there’s no direct way to legally force them to. They do so because of popular demand and indirect requirements from large customers.