So, I went to the Epic Games store to get Subnautica, since it has been sitting in my steam wishlist for a while now. I was happy with it, until I tried to play the game on my computer when I wasn't online. Turns out the Epic Games Store won't let you play your games unless you are online. So if the store's servers ever go down you lose all your games. I'm thankful for the free game and all, but I couldn't imagine spending money on something that I could lose access to in the future.
TL/DR Don't buy games from the Epic Store. They are filled with the worst type of DRM.
UPDATE: They are working on getting the Epic Store to run games in offlinemode.