Last year S/A wrote pretty interesting article about this situation: https://semiaccurate.com/2017/11/06/qualcomm-opens-apple-leg...
On February 28, 2017, Qualcomm requested an audit under the MSA. To date, despite Qualcomm’s repeated requests, Apple has refused to permit Qualcomm to audit Apple’s compliance with the provisions of the MSA. Qualcomm seeks specific performance of Apple’s obligations under the MSA to provide sufficient information to Qualcomm to confirm that Apple has at all times complied with its obligations related to Qualcomm’s software.
Those, if true, are not going to go well in a court. The section gets worse and worse the farther you read.