It’s not some conspiracy, if you are at a 50/50 win rate, that means you are at the appropriate skill level. If you’re better you would have more wins and you’ll move up the ranking until you start losing more games, where you will fall down the rankings to where your average is.
It’s skill based ranking after all, some people have good days where they are better and some also have bad days. It all averages out, but 50/50 win rate means you are appropriately ranked.