Or maybe some players are better than you and they win. Blizzard never had to micromanage HOW you will lose. You WILL lose sooner or later by just raising your MMR after you win a little.
Those people can’t even fix a game-breaking bug (Titans freezing bug) within a week of discovery: and you think they have the skill to micromanage how you will lose every single match?
If you want to find unethical behavior from them: micromanaged rigging is unlikely: it’s more likely they just overtune the K-Factor of their Elo-like algorithm to keep win rate at ~50%.