They want some control over their OS. Ubuntu have dropped Unity support and OEMs couldn't anything about it. Suddenly user experience changed and transition Un

They want some control over their OS. Ubuntu have dropped Unity support and OEMs couldn't anything about it. Suddenly user experience changed and transition Unity-> Gnome wasn't smooth. This was breaking point. OEMs wasn't happy about it and to make sure they don't have to be same situation again they have made their Ubuntu flavors/distributions