there is a huge difference between people who go to the pcbang once 2-3 times a week and queue up with friends with no intention of improving and those who actually play by themselves and want to improve.
All the friends that I know that played like that…(over 30) are exactly at the rank they started…no improvement after the 30-40 hrs they put in…it’s as casual as it gets…everyone was playing overwatch in korea when it came out