The term 'human trafficking' is emotive and ill-defined. And without knowing what definition you use for 'human trafficking', it is difficult to answer this question.
If you are using a broad definition whereby women are recruited overseas and their airfares paid for so they can come and work on some sort of contract, then it is certainly quite widespread. But so therefore is the 'human trafficking' in many other industries such as hospitality, mining, forestry, fast food industry, healthcare, farming and so on.
Think of the number of Aussies that have been trafficked here and are now slaving in Whistler...
But, if you are referring to the number that have been mislead and forced into the industry against their own will, then the number is probably very small. Some figures given regarding the industry suggest that the majority of human trafficking of SPs is from within Canada, particularly of First Nations women. So, you need to be careful of those operations who don't have women from outside of Canada as well. But again, it depends on how you define trafficking and it is an area where it is very difficult to have accurate statistics. However, I am very confident that the majority of ladies who advertise on this forum and actively participate, are NOT trafficked. So, there are still plenty of options out there if this is an ethical issue you are struggling with.
Are there any ladies who wish to disagree with me as they feel they have been trafficked?