most people don't know about aliexpress, and so you are technically overcharging when you charge 4 or 5 bucks for a 1-2 dollar item. you can also just sell items for listia's currency, then use that on
gift cards, or transfer to an exchange, convert to ethereum, transfer to coinbase, and sell for USD, but that's kind of complicated if you're not familiar with cryptocurrencies.
the reason there are so many results for "listia scam" is the same reason you'll find results for any site when you put "scam" after it, because it gets views, and because, like any platform, there are people who will try to scam you. in addition, listia markets itself as a way to get free stuff, which causes people to question it, even though it's technically true, you just need to give free stuff first... usually on listia, it's blatantly obvious when a seller is scamming as the photo for their item can be reverse image searched, their profile will be new with no feedback, and they'll be charging very little shipping for a valuable item. in these cases, paypal will refund you, and no listia currency is received by the seller until you mark the item received.
drop shipping is simply acting as a middle man between supplier and customer, charging a markup, and making a profit. listia is simply a platform on which to sell things. this is simply a guide to effectively utilizing it to drop ship.