The fast growth and success of the battle royale genre has been attributed to many , including the way all players start weak and removing any obvious advantage for players, and being well-suited for being a spectator eSport. Other factors including specific games' business models, such as "Fortnite Battle Royale" being free and available across computers, consoles, and mobile devices. A University of Utah professor also considers that battle royale games realize elements of Maslow's Hierarchy of Needs, a scheme to describe human motivation, more-so than video games have in the past. While the lowest tiers of Maslow's hierarchy, physiological and safety, are met by the survival elements of battle royales, the love/belonging and esteem tiers are a result of the battle royale being necessarily a social and competitive game, and the final tier of self-actualization comes from becoming skilled in the game to win more.