Everyone seems to be talking about Steam but the forthcoming Android store feels to me like a much, MUCH bigger deal.
I mean, nobody stops anyone from setting up a new PC game store, and the Epic PC store is just another entry added to the already long list of stores all competing with Steam. But on Android (outside China), the Google Play Store pretty much has a complete monopoly that they made sure was virtually impossible to break while still being able to be technically called "open." Sure, Amazon Appstore and a few other stores exist, but they haven't really been able to make any real impact due to Google erecting so many hoops for both developers and users to jump through in order to stray from the Google Play path. (eg. Google Play Services, "Unknown Sources" checkbox buried in Settings app, etc.)
But now Epic is forcibly prying it open by using Fortnite as their lure to induce people to actually jump through Google's hoops that were supposed to be insurmountably high user friction. Of all the past alternative Android app stores, this one sounds like it could actually work.
The ensuing Google/Epic all-out war should make last year's Google/Amazon Chromecast/FireTV/YouTube feud look tame. Break out the popcorn.