Ontario Annual Yellow safety inspection sticker exemption

Do you use your pickup truck for commercial use?
I'm afraid I don't understand this thread or have ever heard of the yellow sticker requirement.
I owned an F-150 for 5 years and never had it inspected until I sold it. I certified it prior to sale.

Can you explain this in layman's terms?
btw, the upper limit, according to the linked article, is 6500 KGS (kilograms), not LBS (pounds). That's 14,300 LBS, I believe.
This is Canada, and we're metric now (not that I like metric, but that was PE Trudeau's fault).