This is much bigger topic than the 30% commission Apple and Google get from their stores. That's just an excuse to start legal actions, and put pressure on governments. Check who owns EpicGames... the founder+Tencent. Tencent, the same chinese company that developed WeChat.
This is part of the war US vs China, you can not look at these topics individually, Apple/Google vs EpicGames, TikTok sale to Microsoft, WeChat ban... those are just small battles in the big war.
And no, the reason of the war is not to "give costumer the choice to pay how they want". LOL