"Legal looophole" scams
One legal scam I hate are web sites that offer services such as passport, driving licence, visa renewals and similar. They simply accept all your details and forward them to the official government online service, but charge you twice as much. They are set up to feature prominently in a Google search and designed to appear as if they are the official route. Though I suppose it's little different to setting up an e-retail site that simply re-advertises products from Amazon at marked-up prices, and then buys from Amazon as and when a product is ordered, re-packages and forwards the goods to the buyer.