Wow that's awful. You can't just use our stuff like that. Get rid of it immediately!
Proceeds to copy the fan stuff and make it exactly the same and take credit for it even though the character is 40 years old and the gameplay concept they stole from the fan was completely original.
Sega may not take down fan games, but that doesn't mean that they care about or like their fans. You need to keep in mind that they're still just another soulless corporation that's only in it for the profit like all the rest.