There's no wording in that law that says apple has to allow third party apps for alternate app stores or anything to be made available within apples app store. More like apple just has to allow sideloading. Why would Apple want to pay for the server expense of another company by-passing giving apple a share of the profits?
I hate both companies, but if I owned Apple, I'd be after doing the same thing. Epic can get people to sodeload that crap.
Everything disproportionately effects the little guy. Just look at laws that have fines instead of jail time. Or just getting a lawyer. Or eating out or buying groceries.