Stealing stuff and selling it through a fence is not a business. It’s organized crime. A racket.

You could effectively argue drug dealers and bookies are running an illegal business, and I would not disagree. They sell (illegal) goods and services to willing participants. The fences (eBay and other co-conspirators) are running a business too.

But shoplifting isn’t a business any more than muggings and “protection rackets” (give me a cut or I break your kneecap) are a business. It’s just violence.