Why did Netease sue Blizzard?

Copyright infringement disputes and trademark infringement disputes.

1. Copyright infringement dispute: Blizzard owns the copyright of the game "World of Warcraft", and Netease has developed and commercialized chess and card game products with related themes, so there are copyright infringement disputes between the two parties.

2. Trademark infringement dispute: Blizzard's wow trademark and Netease's My World trademark constitute similar trademarks. At the same time, Blizzard also owns many other well-known game trademarks, which will also cause trademark infringement disputes.