But this is the no true scotsman fallacy. Is there any evidence that your definition of communism is possible to attain, without devolving into things similar to real world countries that attempted to become communist? And couldn’t an ancap just as easily claim that all of the negative sides of capitalism are communist because they are all in some way a perversion of a freely negotiated deal?
The whole world is interconnected, so it’s hard to find anything that is the exclusive domain of one continent. Europeans aren’t innately superior to the rest of the world, but they aren’t innately inferior either. And even if they were, the idea that something only “counts” if you never interact with and learn from foreigners is a bizarre and arbitrary rule that goes against most of the important innovations throughout human history.