Because WDFW is not the Tribes. The Federal Gubmint believes it has a special (Trust) responsibility to the tribes superior to its responsibilities to any other citizen.

There are quite possibly some legal questions to be debated but it will not only take time but it will take money. The Feds can just keep printing it, the State doesn't want to spend it in a suit so that leaves "third parties" who might or might not have the standing to sue. But it will take googobs of money.