How does anyone know on this side of the counter how "profitavle" a customer is to AS? After all, per the entry rules: "Lounge members and guests will need to provide at the time of entry, a valid boarding pass for a flight that day on Alaska, Hawaiian Airlines, a fellow oneworldŽ member airline, or one of our additional global airline partners." AS might have issued the partner ticket, AS might not sell as many memberships if it doesn't provide this access, AS might have some other sort of revenue arrangement with the partner - we do not know.
As with pretty much everything else that puts AS not in our best graces these days, AS makes a business decision. We can like it or we can dislike it. We can continue to patronize the airline, or sleep around. We can lament the de facto demise of our once favo(u)rite carrier. We can vent. We can express our displeasure to the "powers that be."
If you saw how AA responded to a complete service failure on a paid premium transcon service, where the FA decided that he wasn't even going to serve all the food courses, wouldn't pass out the NR headsets, and was a most unpleasant creature, you'd have been shocked. Or maybe not.