I don't see that as much of a win.
And Epic is also competing with Steam by having lower cut (5 % versus 30 % IIRC) leaving more money for the developers. It's good for the developers and consumers both.
But I would refrain from investing much more into the platform since what Im seeing right now isnt going to sustain the platform in the long term.
Its one thing if the store has distinct feature like gog, but theyre not. In the end I(and many others surely) use it just to get free games.
It works in a different context ( platform exclusives ) because the lock in / costs to developing for a different platform are far different from that for different stores on a single platform.