https://wccftech.com/warcraft-iii-reforged-custom-games-blizzard-owns/

There are a lot of reasons Warcraft III has been such an abiding hit, but one of the main ones is the ability to easily create and host custom games. The versatility of the Warcraft III map editor led to the creation of various popular mods, most notably Defense of the Ancients, which inspired the entire ultra-lucrative MOBA genre that Blizzard probably really wishes they got a bigger cut of (their own moderately-popular MOBA Heroes of the Storm aside).

Well, going forward, Blizzard is making sure they’re the main beneficiaries of any exciting new genres that might be created within Warcraft III: Reforged. According to the new Reforged ToS, Blizzard automatically has ownership and copyright control over all custom games: