As I say SEGA doesn't have a policy. We're working in one.
The problem with asking for blanket permission like the linked article is that it's too vague and will probably get a "no".
Total War has this:
http://wiki.totalwar.com/w/Using_Total_War_Gameplay_Footage and it's something we may explore in the new Year to help protect our content creators.
Right now it's up to studios or brands to handle this. So I can't help you if your Sonic fanfic videos get taken offline.