Global market for oil. If the oil intensity of your economy is high, higher oil prices impacting all goods/services will outweigh increased oilel revenues.
This is also why historically companies have preferred being vertically integrated to avoid having their supply chains exposed until American economists and brokerages started pushing the cult of specialization. Outside of the US, big conglomerates still operate this way.
They tried this before [0], and calling it controversial would be an understatement. Probably not a great idea to try it again right before the Alberta succession referendum [1].
[0]: https://en.wikipedia.org/wiki/National_Energy_Program
[1]: https://www.cbc.ca/news/canada/edmonton/alberta-separation-r...