For governments provincial and federal , it's always, always , about the tax and royalty revenue
Ontario residents alone paid $6.8 billion in federal and provincial taxes. Canadians as a whole paid over $16.6 billion in gasoline taxes in 2014
In Alberta , over $8 billion in royalties was collected in 2014/15.
Big oil (your reference) is nothing but a cash cow for governments , grit  ,tory or dipper , it doesn't matter
see: 17th Annual Gas Tax Honesty Reports page 18 Canadian Taxpayers Federation May 14th, 2015 @ http://www.taxpayer.com/media/GTHD-Report-2015.pdf
see: http://www.energy.alberta.ca/Org/pdfs/FS_Royalties.pdf