There was the apple gpu fiasco. Apple laptop GPUs were failing at an extraordinary rate in 2010-2011, and Apple were getting harangued in the media about it (which was justified). Apple eventually announced a program to cover replacement of the GPUs, but it was very delayed. I'm 100% convinced the delay was caused by Nvidia refusing to accept responsibility. When the program was released, in order to have the repair completed at no cost, your computer had to fail a very specific graphics diagnostic, and the failure would be linked to your serial number in Apple's repair CRM. At the time, no other apple repair program had this requirement — Don't get me wrong, it makes sense to use diagnostics to verify hardware issues, but they aren't the only tool you can use. I'm convinced Nvidia only would reimburse apple for computers that had a recorded failure of this specific test.

Since 2014, apple has almost exclusively used AMD graphics cards in computers that do have discrete GPUs, and I don't think it's unreasonable to suggest this was motivated with their terrible experience with Nvidia.

(I'm aware I'm not really backing this up with evidence, but I think the publicly available facts about the whole situation support this narrative)