Facebook was a copycat. Google was a copycat.
Every television network in existence would be considered a copycat of the DuMont Television Network.
NASDAQ is a copycat.
Best Buy is a copycat.
American Idol is a copycat.
Not sure where you draw the line on originality.
The word "theft" implies that someone is being "wronged" by the action.
If we ask ourselves "is this the case? Is anyone harmed by the actions of the Samwer brothers?" then, after we force ourselves to really sit and think about the answer to the question, and after we attempt to find real-world examples which support our point of view, then we find ourselves in the uncomfortable situation of being inexorably pushed, prodded, and shoved toward the inevitable conclusion: No. No one was harmed. In fact, just the opposite: the people who now have access to the cloned services now enjoy a higher quality of life due to it.
In short, inasmuch as I share your prejudice, I cannot figure out any way of reconciling that prejudice with the honest assessment that the world is now more enriched than it was prior to the Samwers.