Because that doesn't satisfy the narrative of American exceptionalism. It's easier to point at something and say it was stolen or copied than it is to compete, especially with the political climate in the US.

This isn't an anti-American sentiment. It is an anti-corporate/regulatory capture/embrace and extinguish sentiment (which probably reads the same to many people these days).

Because the companies did it underhandedly without prior consent? Imagine you walked into a hardware store to grab some lumber, didn't pay for it, and the store had to call the cops to swing around your house? That's hardly the typical shopping experience, now is it?