The Blue Speed II being an exclusive for Sega Account owners is a good incentive to get fans to sign up... but I believe they could've done better.
Selected regions only they said, but I believe UK and North America is safe.
(eventhough you guys still didn't get Sonic Rumble early)
For example, you know Mii Studio and how it's exclusive with a Nintendo account?
What if on Sega Account, or at least on www.sonicthehedgehog.com and/or https://sonic.sega.jp a section exclusive to Sega Account owners, where you can design a Sonic Avatar. And that this Avatar can be a playable character in various Sonic games such as CrossWorlds or Rumble.
At least that's how I would get about with it. have Avatars to Sega Accounts as Miis to Nintendo Accounts.
That would be cool. Especially if the Avatar could use acessories from many SEGA Related games before.
Kid Chameleon hat or space harrier outfit may be.