The SNES already has protection mechanisms built in besides the fact that cartridges aren't easily reproduced, like CDs. The Mega Drive / Genesis didn't have such a thing, at least the early model 1s didn't.

And the protection mechanism the Mega Drive / Genesis implements is much less hard to crack and well documented. Sega doesn't even care about it being cracked nowadays, because they allow production of fully new projects for the Mega Drive, without licensing them. Their stance on it is "we don't support it anymore. Do what you please but make sure you make it clear we didn't license any of your work."

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