Washington is corrupt as hell.
They also have a special program that allows RN's in Washington to proctor students at their facilities and make 900 bucks a month paid for by the state of Washington. Essentially giving the U OF W free teachers. Exactly what they stopped the other programs from doing. The also will take the license of any nurse assisting out of state programs and any facility that allows proctoring for out of state programs. This according to a bulletin they released about a year and a half ago. You basically can only be proctoring students from one of the U OF W programs or its affiliates. They passed that rule about a week after banning out of state colleges from operating clinicals in Washington
WGU does have the program you are looking for and is accepted in Washington. WGU also has had a nurse on the BON since the beginning. Same for U of W. For the last 24 years the Govenor's of Washington have all been U of W graduates. As was the former head of the BON for 23 years. Washington DID just join the compact licensure but then made an emergency ruling saying it reserved the right to disallow any school it wanted despite the compact. (essentially making the compact worthless for incoming RN's)
Simple answer is politics and payoffs to the Governor's office who appoints the members of the BON. If you aren't University of Washington you aren't S@@%. On the bright side for you, every year there's one less ADN program at the community colleges, in violation of their charters. They instead transition to BSN programs through the University of Washington, But the Attorney General and next Governor of Washington Bob Furguson is also a University of Washington Graduate and former student body president so its being ignored.
This is the same BON that threatened to take the license of any nurse that publicly disagreed with the CDC during covid, a rule they never rescinded btw, So trash bags and bandanas are effective PPE according to the Washington BON.
Hope that helps