Hey, I've seen a lot of apps both in the Google Play (Android) and App Store (iOS) that are utilities for major, popular games (i.e. MMORPGs). By utility, I mean an apps that you get a better map of a certain video game fantasy land, "skill" calculators, leveling-up guides, etc. Furthermore, many of these apps are either ad based or payed. Some of the more popular ones are obviously generating significant revenue and profit for the developer. These specific utility apps obviously rely on the game being in existence in the first place. What is the legality in this? Are these developers safe just by putting the basic disclaimers on how they do not own nor are affiliated with the game (and its rightful owners)?