I forgot this was still a thing.
It's still one of the best racing games on Apple Arcade (the competition bar was low afterall)
I doubt it be that long.
But I have noticed Team Sonic Racing was released not long after Sonic Generations.
Now Sonic Racing CrossRoads is announced not long after SXSG so I imagine it be similar release time.
You meant Sonic & All-Stars Racing Transformed?
Sonic & All-Stars Racing Transformed and Team Sonic Racing were outsourced, they're made by Sumo Digital.
Sonic Racing CrossRoads said to be made by internal team,
developed by an “elite SEGA racing game team”.
Sumo Digital are not involved in this.