I'm shocked at how terrible the residency definition is on the NDGF website. I guess not a lot of people try to push it; but the vague definition they provide seems like they are really leaving the door open for it to be abused. I agree that even if you move the day before the season, you are no longer a resident. There are legitimate and legal ways to get around it however.
It's probably a combination of the non-resident guide requirements and the PFD but our residency qualifications are extremely well defined up here in two pages of State Statute. As for the snow bird question - we are required to be domicile in the state for a minimum of 90 days annually to retain residency up here; along with about 100 other requirements in unison. Me and my wife are thinking of doing traveler work soon and I've really been digging into trying to keep my AK residency so this is an interesting conversation!
I know a guy that is a lifelong Alaskan that finally drew his Kodiak bear tag last month (to hunt fall of 2019) and he was reassigned to the lower 48 by the military during the time between the application deadline and the time draw results were posted. He will have to eat that tag....