My guess would be public vs private. A lot, if not all, of the stations on that list seem to be government owned but in the USA they are corporate owned. 2000kW

My guess would be public vs private. A lot, if not all, of the stations on that list seem to be government owned but in the USA they are corporate owned. 2000kW is fine if you own all the airwaves and don't have a company in the next city over complaining that you are crowding out their airwaves (of course they might have had other countries complaining...)