Epic isn't putting RL on their store because Fortnite is there, they are building the store to milk consumers, use anti-competitive consumer-hostile business practices, and try to put others out of business because they have effectively infinite money from Fortnite.

I used to be sympathetic to Epic games back when they were developing UE4 as a source available engine and were working on UT in the Linux space. But whatever mindshare begot those intentions seems to have totally dried up - thats not to say Epic was ever a particularly ethical business... from the first Unreal they were pretty run of the mill proprietary games maker selling proprietary engines and running the full gamut of games as a service, exclusives, manipulative game design (loot boxes, achievements, skinner boxes, etc) for over a decade.

Now they are half owned by China, overwork their developers horrifically, and are trying to use mountains of 10 year old kids money to coup the PC game space because the suits want that sweet sweet rent seeking 30% cut of game sales that requires no effort or investment by them through market capture in the long run.