Personally I would say the disparity between what was in their founding agreement "be open-source—freely and publicly available for anyone to use, modify and distribute" https://archive.ph/R0LBL to the current state of affairs.
But I guess the list of grievances could be longer:
But I guess the list of grievances could be longer:
https://garymarcus.substack.com/p/what-should-we-learn-from-...