Ah. Well, I’ve made several and seen more in my career.
They don’t aim for 50/50. Apart from normal elo systems, some things we work with is streaks, ping, class or roles, team width and other things that I probably should not mention.
The goal is to drive engagement, not 50/50 win rates. You just have no idea what you’re talking about. But that’s okay, just don’t use such sure language when you haven’t worked with matchmaking systems.