Just because it is a competitor, it doesnt mean it does DRM. Foremost, it is a service to deliver games to you at a price (and give you a legal proof of ownership).
While I definitely don’t know everything about Epic Games, but my (quick) googling suggests that they do almost no DRM (or just piggy-back on steam, which is minimal DRM). The individual developers are responsible for DRM. Is this not true?
In general, iI feel it is quite a moot point regarding iOS , where Epic wouldnt need to do any DRM, because iOS is locked down to hell…