Saying that, console games are more often than not the size of a Blu-ray disc, with triple-A games exceeding 40-60Gb in size, sometimes larger. Some popular games come on multiple discs. An order of magnitude larger than the less than 100Mb size of most iOS and Android apps, which are downloadable over a mobile connection. The hosting, bandwidth, CDN, and sales costs for the digital versions of those games and their patches can't be cheap, and are often subject to flash traffic surges, particularly when million of players decide to download them (and their updates) the second they're released. This is to say nothing of the myriad of hosted services that are provided that are unique to consoles.
I don't know what business deals are in place, nor can I make a statement on the perceived value that the publishers who publish on consoles place on what's provided, however its worth noting that even before Fortnite was removed from the app stores, the target of Epic's complaint did not include Playstation, Xbox, or Nintendo.