I would be very surprised an angler who has spent days trying to catch a hatchery steelhead would release a male. For sure the top rods who fish every day release hatchery fish, but they are few and far between, imo.
It was just my opinion, on the other hand I don't think anglers go steal heading to catch a hatchery stealhead, I think they go steal heading becouse they love fishing and stealhead is a top prized fish to catch so it just normal human nature that anglers would like to catch these magnificent creatures.
Now all the anglers I know and there is at least 25 I could name if I had to (I never would online lol)all great stealheaders, and will for sure choose to let a buck go and kill a doe just becouse they get the roe...
That's why I throu my thought out in the previous post