Koyu has 11.2K known peers (higher means more federation exposure)
QOTO has 12.9K known peers and
So QOTO is about 10% more federated. But the Koyu numbers arent bad, QOTO just tends to be far ahead of most instances in terms of federation.
I dont think they really block anyone significant. They have had some issues in the past with being blocked is all which likely slightly lowered their peer count. That said its not significantly high.