In usual fantasy stories, magic is always restricted by something. There are drawbacks, item requirements, it depletes mana, whatever. But the magic in this world is stupidly powerful, restricted by almost nothing. If you know the spells and can speak the words, you can cast them repeatedly. The restriction on magic is the social order that is maintained with heavy censorship. The ruling class of every nation is busy keeping rogue mages from running rampant. And rigidly dogmatic religions add numerous rules to magic usage, with harsh punishments for anyone crossing the line. Nations are in perpetual struggle to retain the social order.