Hidden Rank system MMR screwing some players over, WHY?

So I realize this game is trash. Why? League is "competitive" however they have a system to screw players over that are doing well. MMR is a hidden thing you have to look up, and basically what it does is match you with people outside your division if you win too many games in a row. So if I am Bronze 2 and win 3 to 5 games in a row, then I will play with people with really high rank with low MMR, like a plat player who lost a few times, verses me the bronzie who won a bunch of games in bronze, now I am playing with Gold and Plat losers that are way better than my bronze division matched buddies. By the way, I am salty af and I hate you if you afk from games, say you're tilted, play champs you don't understand, lose on purpose or any other dumb thing you could do in this game.