Guiding is making profit off a public resource. In BC to hold a guide licence costs $600+ a year. You need insurance $1500/yr. All boats you use (including inflatables) need to be certified and registered with transport Canada. You need FN and gov't permission for specific provincial parks (and have to pay $$ for each park). And the licence holder is only allowed to guide on certain rivers that the government agrees to. Accepting money to take someone fishing without all this is unfair to the great people out there with small family businesses that follow the rules.
Since guiding is making a personal profit off a public resource, it is not a stretch to equate it with mining, logging, or commercial fishing. All which must be done with government permission and within the rules agreed to. To protect the resource, and level the playing field for competition.
I would not equate illegal guiding to Germany's behavior during the second world war as was previously mentioned, but I would say it is on par with black market logging, mining, or commercial fishing. Which I am certain we can all agree are terrible offences.
Campbell River, BC