Perhaps I should mention how the station I consulted and programmed in Buenos Aires dealt with pirates:The modern Pirates aren't interested in 100W and all the paperwork, they just do what they want to, at least until they get shut down.
Metro Buenos Aires is about 20 million, so it's a bit bigger than New York City. It is immense in geography, extending way out from the River Plate inland. It takes 50 kw to 100 kw on AM to cover well. And where there appears to be an open channel, someone on an apartment building will build a pirate. Dozens, maybe hundreds.
The station I was with had a truck with direction finding gear. If a pirate was reported on adjacent channels to us, the truck would go out and find the pirate. The "inspectors" were big guys and wore one of those belts an electric company repairman uses... lots of tools, and some were large.
Pirates were told to get out of the way of the station's signal. If they were not gone the next day, the tools were used on the antenna and the cables. The more that was done, the fewer pirates came near us... apparently they communicated with each other.