Well, in every team-based PVP game one side has to lose (or a tie in sport games sometimes).
This isn't even a match-fixing because while outcome is predicted, nothing beyond matching "weak" team against "strong" team is done to ensure that outcome.
I mean, it's shitty that blizzard decides that you had enough fun crushing it and now it's someone else's get that dopamine. However, on other hand, it's nice if you're on the otherside sometimes. I will admit that sometimes it matched us against team that was so weak it wasn't even funny.
What matchmaking did there is multiplying a rank for each consequent win starting at 3, and because even square of it made kinda ridiculous number it will fill the gaps with bottom rated players in queue against infinitely stronger team. Now you know why you got stomps delivered by the system.
Blizzard does it. Especially in overwatch.
It's called engagement matchmaking