The details of that aren't public other than both companies want control of the driver stack and neither is willing to budge. The driver breakage happened betwe

The details of that aren't public other than both companies want control of the driver stack and neither is willing to budge. The driver breakage happened between major operating system versions that had significant graphics systems overhauls so would not be compatible as is. I don't classify that as lock in. It's an unfortunate side effect of business dealings between two immovable companies. However apple does work with AMD and Intel GPUs, and still allow AMD external GPUs.