A big part of amateur radio operations is knowing what the allowable frequencies are for where you are - when I first put the “DL” (for Germany) ahead of my US

A big part of amateur radio operations is knowing what the allowable frequencies are for where you are - when I first put the “DL” (for Germany) ahead of my US callsign, it was a) to let everyone else know I was operating in Germany, and b) to acknowledge that I knew what the rules were for operating in Germany. “Don’t play music over amateur radio” is another big one that is literally a question on the Technician (entry-level) license exam. Also, broadcasting (transmissions intended to be listened to by non-hams) under an amateur license is illegal in ordinary conditions. That’s what broadcasting licenses are for. And trying to bump people off a frequency is considered the height of jerk behavior. So, good for the FCC, an excellent use of our license fees.