I'm not a charity and developers are not entitled to more of my money. My relationship with the developer is exactly the same as my relationship with the farmers who provide groceries to the store and the people making cloth for the clothing store - which is to say they are nothing more than a business who want my money, and I don't care how much the middle man is taking.

Epic would love nothing more than to be a monopoly and you certainly aren't going to hear Sweeney throw a tantrum if games exclusively released there. Lets not pretend like Epic are some altruistic company, and I'm certainly not about to start buying there just because they exist. It's on Epic to give me as a consumer, not a developer a good reason to buy from them over the alternative, which to me means providing a better service.