I think people got the idea because Sega doesn't sell the Sega genesis nor the Dreamcast, And they had Sonic games on Nintendo consoles like Sonic Heroes being on the Game Cube or Sonic Frontiers being on the Nintendo Switch.
They are just brothers,
Minecraft:also try terraria!
Terraria:Also Try Minecraft!
Meanwhile:
Minecraft:DO NOT try lego fortnite
Terraria:DO NOT try lego fortnite