Brokers and people who sell miles will typically provide their Alaska login info, so when Alaska starts seeing CA/WA/AS based accounts logging in from foreign points is where the flag starts.
Many companies are now starting to block some VPNs- for instance Im up in the Yukon right now and I use a VPN with 2 selections of locales in California to use Amazon Prime, Hulu, etc. Well, Hulu now recognizes the VPN & blocked it. So no more Hulu for me
Ill bet ya Alaska is now monitoring that traffic as well...