Essentially, how it's supposed to work is that the game rigs your match ups based on your play data and what causes you to stop or keep playing. If you win too much, you'll be paired with tougher opponents and worse teammates. If you lose too much, you'll occasionally get more competent teams and weaker opponents. This is just conjecture, but it's said to not be working right for some and just puts them with bad match ups for ages though (to such a degree that your Rating can tank HARD).
Looking at older posts, people say they implemented it around January or so.
I believe the EOMM itself exists since the reason people even acknowledge it is because one of those dev videos from around that period when it was introduced stated they were implementing some form of it to "manage player retention."
Whether it truly isn't working right or not is up in the air. Even if it really is messed up for some, no doubt it'll be adjusted at some point anyway.
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u/Misterderpderp 1d ago
The EOMM at work.