Why be indignant at the execution of a classic strategy? They are your opponents after all. You are a very limited resource, even if you were somehow dedicated 24hrs/day to GPL enforcement. Why have they not dedicated a bit more of their vast resources to occupying your limited resources? Do they just not find GPL enforcement a very important threat? That's what I'd be indignant about.

Your classic strategy of refusing to break coupled with (elsewhere) dismal prediction of a dark age brings to mind that folk tale and song about a steel-driving man.