Cost and the environmental movement..
Cost: because the capital expense required to build extraction plants and support facilities up there would be humongous. The ROI (return on investment) period would be very long, if ever. Especially as the world is moving away from hydrocarbons/
Environmental movement – even if you could get permission to build facilities in the permafrost (which is itself very, very iffy given the history that the evironmental movement has it stopping sensible development) – there is no chance that envrionmentalists will support the infrastucture, shipping, inevitable spills, and human effect that petrouelm capture development would bring about.
No oil company wants to fight that sort of struggle with so little dollars to return
The bucks aren’t there and the tree huggers would make it impossible.