You are dealing with opinions and statements of fact here, no room for fallacies.
1.It is generally a bad thing for a publisher to not be able to sell their game to any storefront they want.
Opinion. This should be supported with arguments, then we can look at those arguments for fallacious reasoning.
2.A publisher made a deal with a store (Epic), to sell their products exclusively to that specific store.
Statement of fact... they either did or did not.
3.The publisher made a bad deal because it cant sell their products anymore to any storefront they want for at least one year. (the exclusivity deal is for one year)
Opinion and statement of fact. "The publisher made a bad deal" is opinion and "because it cant sell their products anymore to any storefront they want for at least one year" is either true or not (statement of fact).
So no fallacies I can see here. Of course, this doesn't mean the opinions are based on reason or what is stated as true are factually true.