Because Epic has so much sway in the video game console arena that the console makers (except perhaps Nintendo which relies more on 1st party content) would never dare take anticompetitive action against Epic, or at least do while granting Epic-specific concessions which make it hard for them to have standing for a anti-monopoly lawsuit.
Epic wants an antitrust decision from the courts and/or regulators, and that requires them to get a clear, unequivocal rejection from the platform owner to have unchallengeable standing. A game console maker would have met Epic halfway, but Google and Apple did not.
The timing is probably also critical: Google and Apple just testified to Congress that they're not engaging in monopolist behavior because they treat every applicant equally. To back down from that right now would mean they perjured themselves before Congress. That's something no one in their right mind would want to do.
Epic wants an antitrust decision from the courts and/or regulators, and that requires them to get a clear, unequivocal rejection from the platform owner to have unchallengeable standing. A game console maker would have met Epic halfway, but Google and Apple did not.
The timing is probably also critical: Google and Apple just testified to Congress that they're not engaging in monopolist behavior because they treat every applicant equally. To back down from that right now would mean they perjured themselves before Congress. That's something no one in their right mind would want to do.