I wonder if you can explain to me something that confuses me a little.
What exactly is the relation between Sega and Paramount when it comes to making Sonic movies?
Is it like video game consoles where Sega makes the games entirely and Microsoft, Sony or Nintendo agree to put their games out there through their consoles? As in Sega has the studio to make their movies and Paramount puts them in the cinema.
Or is it like Archie and IDW comics where Sega commissions the publishers to make comics on their behalf, allows them creative use of their characters and content under agreements and only limits them by mandates? As in Paramount made the movies in their studio and Sega approves of them.
For the first movie it's the kinda later, many studios were hired by Paramount but still one of them was SEGA's studio (Marza Animation Planet), who's helping to provide the visual effects.
Why Paramount didn't use their own studios? Because all of studio was already pick by Sony but Sony then dropped the ball and Paramount's willing to take over the project and they still want most of the team unchanged.
All the decision is on Paramount though, SEGA is just some kind of a consultant.
That's why we almost have that horrible design of Sonic, even though SEGA advised them to change (before the first trailer show up) but rejected.
Mandates aren't as strict as IDW Comics since IDW Comics is continuation of the game while movie is separate universe.
Still not much information for the second and third movie, the relation could be changed after that but I doubt it.