You seem to be using a different definition to the word "flattery" than any I know. Being copied is inherently flattering whether you want them to copy you or not.
Regards your second sentence, that is what I'm saying. A large company that's put lots of resources into something fighting of another company who "stolen" their idea, while tedious, makes some sense. For an individual, I can't see how it's worth the time, stress or money to worry about copyright.