Did you read the article? They had to pay because they couldn't prove that the owner knew about the illegal activities going on in his house. That doesn't mean they can't refuse to pay others who have a fire with a grow even if the fire is unrelated to the grow.
"In June, 2010, Wawanesa stated to Davidson that if Wawanesa had been “made aware” that the property was being used for illegal activity, it “would have declined” to issue a home insurance policy.
Wawanesa argued that Davidson’s failure to disclose illegal activities on his property “constituted material misrepresentation.”
The central issue, on the issue of misrepresentation, Justice Fitzpatrick wrote, was whether Davidson knew about the illegal activities.
Wawanesa “has not introduced any direct evidence that Mr. Davidson knew of the illegal activities in the Residence, but relies on various circumstantial evidence,” including a video, recovered by an insurance adjuster from Davidson’s camcorder, she wrote.
“This is a case close to the line, but I accept the evidence of Mr. Davidson and find, as a fact, that he did not know of the grow operation or even the other activities relating to potentially stolen property or potentially illegal firearms over the relevant period of time leading up to the fire,” she wrote. “Simply put, Wawanesa, while presenting a compelling case and raising a number of suspicions, did not meet that burden of proof.”
In order to prove material misrepresentation, Wawanesa would have to have proven: there was a change that was material to the risk; the change was within Davidson’s control; Davidson had knowledge of the change; and neither Wawanesa nor its local agent were promptly notified in writing of the change."
I wonder how the insurance companies deal with fires where people are growing veg and herb exactly the same way we grow pot. Why should they get a free ride?