Stockholm syndrome?
Epic competed for developers on a more competitive split, but have done little to entice users; their platform didn't have even the barest of (edit:) feature* parity with Steam at launch (or even today), and rather than, say, fund new titles for their platform, they've largely paid for existing or in production titles to not appear on their competitor.
They're competing based on attacking their competitor (and/or users of their competitor's platform) rather than by bolstering the merits of their own platform.
It's a shallow distinction but a fair one for consumers to make. "We have helped create this thing for our users" is different than "We paid to prevent their users from having a thing."