Epic is obviously doing that for their own monetary gains, but i definitely don't care: apple and google are also giants, it's just the big dinos fighting over more money. Howeeever, if Epic wins, thousands of small companies and indie devs will gain a lot. I am an indie dev and I can assure that those 30% hurt. Remember that we also have tax to pay. Apple and Google are making money out of every inch of their phones.