Tourists traps excel on this niche of scam. They serve bad food at high prices, but quite often not so bad or expensive as to be illegal. The only reason this business exist is because most people would visit them just once, customers are replaced each day with new arriving tourists.
Everybody is a clueless tourist in the sea of Amazon products, applications in the App store or literally on Airbnb. They only need to sell once to a very small percentage of Amazon customers to be very successful, even if they never come back for obvious reasons.