From
https://www.digitaltrends.com/business/apple-vs-qualcomm-news/
As we all know Apple is in legal war with Qualcomm over fees for iPhone chips... with a lot of similarities to this, except their arguments in that case are more akin to Spotifys when it suits them.
"Apple’s documents also mentioned that Qualcomm required Apple pay a percentage of the selling price of the iPhone in return for the use of Qualcomm patents, and demanded that Apple use Qualcomm chips exclusively between 2011 and 2016". [seems similar to apples 30% of revenue requirement vs flat cut or other revenue split formula]
“We are extremely disappointed in the way Qualcomm is conducting its business with us and, unfortunately, after years of disagreement over what constitutes a fair and reasonable royalty, we have no choice left but to turn to the courts,” Apple said in a statement