All those major studios listed have their own game engines, so unitys decisions don't affect them anyways. And Epic develops Unreal Engine, so Unitys' loss is their win.
I thought their games were run by a 1000 year old abacus.
Bethesda is making the same game in a different package ever since Oblivion.
The big publishers only used that engine for a few offshoots and this change will guarantee that won't happen again.