Long time (maybe twenty years) ago I read about a fascinating scam. The scammers were announcing a totally cool sex toy (maybe early VR, don't remember), but they never intended to deliver. Through clever marketing they managed to find enough potential customers who were asked to prepay a certain amount to finance production of the product (comparable to crowdfunding). When delivery day arrived, the scammers sent out letters to the customers with an apology that something went horribly wrong and the product could not be delivered. The letters included a bank cheque with a full refund, but the cheque said: "Refund for Sex Toy XYZ". As planned from the beginning, most customers were too ashamed to cash the cheque, so the scammers kept most of the money. Legally (?).