Hello Canadian!
Yes, assuming you are buying a non nfa gun you’re allowed to have from a person instead of a ffl holder you can completely legally buy a gun with no license or background check.
There are many additional jurisdictions that place restrictions on that practice though.
You’re wildly overestimating the volume and enforcement of what can be called consumer protection regulations.
Take canning, for example: there’s no law against advertising some device that can’t reach 15lbs of pressure, the requirement set forth by the fda to prevent botulism, as appropriate for canning even for low acid foods like green beans that are the exact target for botulism.
There’s no law against selling a lithium battery powered device that relies on the controller built into its specific power brick and it’s specifically wired usbc terminated cable for overcharge or overheat safety and reliably catches fire when it’s plugged up to any other power brick/usbc cable combination.
Idk about Canadian canning laws, but I know for a fact that there are no protections about the other example in the great white north because the same design has been all over insurance claims for house fires there too.
Toyota, Nissan and Mitsubishi never made a 7.3 (although some of those Mitsubishi diesels are nice).