People blasting awful music any time of the day or night, anywhere (neighbours, beachgoers, public park, transit) is enough of a problem in my country (Brazil) that arduino/Raspberry Pi/ESP32-based bluetooth jammers are somewhat common.

I would never try to use it though, as you can very realistically get killed in retaliation.

How could you get in trouble (aside of this probably being illegal, at least I know it is in my country)? How would people know that you are jamming the signal, and not someone else?