I have played 14k battles in the past 3 years and spend some money on premium subscription. This game is huge in Russia and China and even both European servers have 150k players each during the day with queue times for 15 player matches in around 10 seconds. They are a competent developer that has continued to update their game through these years. Although they need to hire better programmers to optimize it, fps is pretty terrible at times.
There are a lot shadier F2P games than this one.