Apple isn't deserving of a slice of revenue from game developers because of questionable gaming practices. If anything it makes them complicit. Like a mafia syndicate, they will allow these types of gaming practices if they are given their share.
The whole point of Epic side loading apps was to avoid the gatekeeping of the primary stores and their ‘review’ process. Was it a terrible failure because Epic is incapable of creating functioning software? Or was it a failure because it's near impossible to circumvent the limited developer 'sandbox' with APIs that all run through Google services? Are apps listed on Google Play free of security vulnerabilities? Who’s to say this information wasn’t disseminated throughout the public and media by Google or Apple themselves attempting to sway opinions against the so called evils of installing your own software.
As far as Epic vs Apple, whether the judge ruled Apple a monopoly or not isn’t of great concern. What’s more important is that she ruled Apple must provide other payment options to developers. It's in the user's interest that alternative payment methods are made available as it (in theory) will decrease the cost of app purchases. Apple's not in any hurry to implement it through.