"they haven’t stolen anything from you" correct by the legal definition as my non lawyer brain reads it. https://www.law.cornell.edu/wex/theft

"so you have nothing to complain about" incorrect. Copyright infringement is it's own crime with it's own penalities.

The terminology section of this Wikipedia article is quite informative on why copying is not theft according to the US Supreme Court.

https://en.wikipedia.org/wiki/Copyright_infringement

A big difference in theft vs copyright infringement is if you go to jail or not (criminal vs civil). Again, not a lawyer.