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Sega on the other hand, famously allows just about anything. There already is a several year-old decompilation project for the Genesis version of Sonic 1. There is a well publicized Sonic fan game and hacking contest every year, and heck, they even added official Steam workshop support for romhacks to their Genesis games. That isn't to say they could change their mind at anytime, but the only Sega project I'm aware of that was C&D'ed was the Streets of Rage Remake a few years ago.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.