The General Mobile Radio System requires a license, just like ham radio. Just like ham radio, you can get in trouble for using the system without a license.
Realizing the severity of the storm, BroadNet announced to their users that, for the Hurricane Ian landfall, their linked system would unlock Zello, connected to that repeater system, to all users. Users heard updates from the National Weather Service and those in the affected area could call for help.
While it's not ham radio, a number of GMRS users are also ham radio operators. For example, the Slidell radio club lists a GMRS repeater on their web site, along with instructions on how to get a license.
Kudos to both. Public service IS public service when the public is served. No, I'm not encouraging ham radio systems to open up their networks to non-licensed individuals BUT surely we must be listening for the Mayday call. For example, a 17-year-old used an officer's radio to call for help, after he had been shot and after she had applied first aid.