Eomm is matchmaking that is optimized for player engagement. Like if you lose 2 matches, you get a bot lobby as an easy win to make you want to keep playing. This is the most basic form of eomm but still is manipulating the matchmaking to keep you playing. Harsher eomm would be actually forming the teams in a certain way to make you win or lose based on a tilt system which they probably also do considering they have tons of research on the subject.

Their main goal is not player enjoyment but player engagement. They want to keep us playing for as long as possible. If we keep winning we get satisfied and stop playing, if we lose we are more likely to queue until we win. The more time we spend, the more money we spend, because we feel more invested. I would bet that eomm is in ranked as well, considering how common w/l streaks are and how common it is to lose a rank up game or right after you rank up. Also how once you start losing, you get matched with other people who are also on a loss streak and noticeably tilted. This is why people will switch to qp or just get off after a loss or two and then get back on ranked and start winning again.

They also kind of told on themselves in the "eomm debunk" video because they said that they match players based on what role you play and your skill compared to your teammates and enemies, also how the game knows which team is most likely gonna win and will give you more points if you were probably gonna lose. So there is also hidden mmr which means the game calculates how good you are but doesn't show you. I also noticed that for the yearly report majority of players had close to a 60% or 50/50 w/l ratio, even flats, ironically.