Well, that makes more sense than "Hasbro can't use it because Takara Tomy has it trademarked", but this would be the biggest trademark either Hasbro or Takara Tomy ever lost, wouldn't it?
Specifically, Sonic Adventure established Eggman as a nickname in English, and either that game or Sonic Adventure 2 established Robotnik as his family name in Japanese.
Technically, any interaction between distinct worlds in a multiverse does make each a part of the other's "continuity".
At the same time, it's the most definitive way to make them not the same universe.
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