It is a big loser for the buyer. What if the seller is fraudulent? Now you are out on the BTC and there is absolutely no protections or regulations on getting that money back. Why wouldn't you just use your credit card with excellent consumer protections provided by your issuer?

It doesn't actually solve anything from a KYC or trust perspective, which is at the root of lots of these problems. A good interaction is "I, the buyer, have money, you, the seller trust me that I have the money that I am digitally transacting to you. After the sale is made, the transaction clears, I have less money, you have the money instead." This contract breaks when either side doesn't do their job -- provide the money for the service, provide the service for the money. BTC doesn't solve this for both parties.