You don't need to dig that deep. Brainstation sells bootcamps in downtown Toronto. If they can show that working in tech in Toronto yields crazy opportunities and salary, they'll get more people to buy their bootcamps.

If you look behind the stories and check on which company's blog or who wrote these praises to Toronto, you'll see they all have something to sell from people thinking that Toronto is the place to be. Usual incentives include: difficulty hiring cheap talent, astroturfing for more VC money, selling a Toronto-tech related product.