Cynical or not, putting pressure on companies works and negative attention is a valid tactic when the issue is subject to reasonable debate.

Considering their volume fifteen percent should still allow them to rake in ridiculous amounts of money. However one area I still support Apple is selling of additional product within the store should still be subject to a charge; as in the Epic store selling additional games should be subject to the same rules as selling any content on the store yet you should be able to purchase outside the store and redeem codes within apps to use them; similar to how Steam allows developers to sell keys outside of Steam