The basic assumption being that under skill slants odds badly so you should expect see higher odds of loss streaks and longer streaks cuz they are dead weight or Higher odds of win streaks and stronger streaks cuz the odds are expected to slant away from "Fair" 50%.
Throw in some common human behavior like getting excited or frustrated (win a few, this is working. Keep doing it!. Lose a few, this is not working better try something new!) And you really should expect to see streaks.
Rn=Ro+K(W-We) being the basic representation of a Elo adjustment formula. Basic MMR MM Takes Ro with in a range for fairness designed to represent the weakest player in the game have performance results the system expects could potentially beat the best player in the game.
https://imgur.com/a/4rCIT6K
Then the Adjustment accounts for individuals as individuals rather then equal parts of a singular team. So K and We variable see impact.