Using bitcoin to make purchases in a #Bitcoin economy would be exactly like using V-Bucks in a Fortnite economy or Robux in a Roblox economy. 

V-Bucks are the in-game currency for Fortnite. You can use V-Bucks to purchase the following items: Outfits, Pickaxes, Wraps, Emotes, Battle Passes, Gliders, and Contrails.

Robux is the virtual currency used in the online gaming platform Roblox. It can be used to purchase a variety of in-game items and upgrades, including: Avatar accessories and outfits, Special abilities in games, Weapons, Other objects