It's hardly that, LoL is a variation of Dota, but this this copies everything right up to the maps, construction system and even the battle system. The entire game is a blatant rip-off. I'd say if they kept it in China, then sure, but they are going to have a booth at E3 to showcase the game, which basically amounts to trying to take credit for the game like they practically invented it. Hell no.
If Valve and Blizzard can sue Dot Arena for using their designs in a mobile game that is in no way similar to a MOBA, I'm pretty sure sueing them for a couple mil wouldn't be too hard considering they are using everything right up to the name(which is just translated into Chinese) AND they already plan on releasing the game in the near future as their own intellectual property. Might not stop them completely, but might at least make them change it so it won't be seen as a total rip-off. I have no problems with some friendly competition, but steal from others? They can GTFO with that schiit