"Everyone has the same chance of getting bad teammates
It's often compared to a coin flip that's not entirely true. It's actually 9 coin flips. The strength or weakness of each player is significant. If I were to sit down with another person and we each rolled a 9 sided die there is a chance that one of us may pull drastically ahead after consecutive roles. I've gone an entire night of playing MTG without winning one "who goes first" roll.
Now let's say it's a coin flip. 50/50 out of 100. This does not mean that you win then lose win then lose..... At the same time that is exactly what it could be because the 50% odds apply to each flip. Two players may indeed get 50 wins out of 100 games but the order they are made in can have drastically different outcomes in what rank Each ends up in. Furthermore because each flip had it's own odds it is entirely possible to win 100 out of 100 flips https://m.youtube.com/watch?v=Uq39ofDtYPA