Yeah that is a bit troubling. It's not so much a tax as it is a "cut" in the deal. I think the rumor is that Alaksa takes 75% of the value of a barrel of oil. Don't take my word on it. I am not sure.
Wrong. Alaska get 75% of the “Royalties” on the oil and the US gov get the other 25%.
Its no more than oil companies pay for drilling on private land.