MM is a joke, so ppl who want to be good play faceit, which. If you don't BUY faceit premium, your enemies who bought it can select up to only 3 maps to play which they prac on, these can be ur least best maps. So by paying, they get an advantage over you.
Also if you have premium you have way higher odds of being the captain and bad the maps u dont like.
Definition of p2w: "Pay-to-win, abbreviated as P2W, describes an aspect of a game where players are allowed to get an advantage with real-world currency"