Which can be said about every game that is exclusive...but we don't know if that hypothetical "missed sales" has already been dwarfed by the Epic payment and percent split for each sale...it's most likely made back all costs plus from this move which is great for the dev...
Let's be clear about something: Epic doesn't gift "free money" around. If what they told everyone publicly so far is any true, they guarantee a minimum of sales.
This greatly reduces the initial risks (i.e. if you have 200K guaranteed sales and you only sell 20K Epic makes up for it) but it doesn't guarantee a breakthrough success )if you sell 250K, Epic still pays 250K, the upfront bonus becomes null).
What else we know about the popularity of their service for anything that isn't Fortnite? Without actual numbers we can only look at how other games are doing.
Here's the thing: most of them have virtually faded into oblivion since their launch. Some of their exclusives have been so obscure virtually NO ONE is talking about them on the internet anymore.
Operencia is basically lost in the mists of the internet. No one is talking about it.
Dangerous Driving is a goner (also, appartently a driving game of very forgettable quality, so not surprising).
Ashen, Hades, whatever else could you mention: definitely not the talk of the town.
The only game we have numbers for is this one, and bizarrely enough this alleged success does't seem to match all the other stats: online games are reportedly hard to find on PC according to a lot of people, features are missing making players unhappy and Twitch views may be among the lowest we have ever witnessed for a "popular" new launch despise Epic bragging about them in the first two days when they were artificially driven up by paid streamers.
No, in the context of the entire EGS userbase it is very much a fact. A very small percentage of the total userbase decided to download games that were available for free. 90%+ of the userbase didn't even bother to redeem the free copy.
Which is interesting, given that even a lot of the people who swore to never purchase anything there (myself included) redeemed those anyway.