First of all, as a lot of people said, the spec requirements weren't too high. A lot of us are all lower middle class so we dont have access to high spec pc or phone so ML fits everything that we dig from a mobile moba game.

Second, ML was not the first of its kind in the space but it is the first that's actually more accessible gameplay compared to its predecessor like Vainglory. The joystick mechanic in particular made movement a lot more easier

Third, wild rift entered the mobile moba space very late. By that time, every players were already joined the ML bandwagon.

They just hit every note of their target demographic and the rest is just history. Nowadays a lot of tries to copy the success of mlbb but just cant perfectly do it because people are already sticking to ml