Did you learn about a court issue they had to deal with? Blizzard filed a lawsuit against Lilith games and Lilith games filed a law suit against Ucool for copying some of their characters in another game they made called:
Heroes Charge(https://play.google.com/store/apps/details?id=com.ucool.hero).
If you wanna know more about it click this: https://strebecklaw.com/the-mobile-app-cloning-lawsuits-continue-blizzard-lilith-games-and-ucool/