This is not true. It is the choice of the local jurisdiction (or sometimes the company so chooses) to abide. The US does exert leverage in many situations as one might expect the EU to do. But acting as if every country is 100% beholden to US law with no sovereignty is wrong and just excuse-making. There are many places that don't respect DMCA making your statement very false.
Maybe so but it is effectively imposed on all citizens of the world. Other than for the now rare cases that people are serving stuff up from their home.