Been saying this since the latest patch hit
same thing happened to WoT. Low tiers can't get a match because the community grew small and nobody wants to play low tiers, and high tiers can't get a match because nobody wants to pay the maintenance costs AND the grinding and matchmaking on top of it leaves you in a tiny island.
But you can't get matched with the middle people, because tiers.
Saying "I said so" just didn't quite say it.