not only do they reward you so much just for playing the game they also have a pity system that allows you to select thr exact unit you want and their exclusive gear as well. If you play yhe game they pretty much give you everything. Sure you can pay 2 win like any other one but if you actually play the game and grind you will have everything

This game is generous in giving gems to players especially when there is an event going. Trust me I'm f2p yet I already collected 80% of the characters in just few months of playing.