lets say u send somebody btc and they dont send the product, so what stops somebody from leaving a negative rating for you after you leave a negative rating for them, they are dishonest so is it hard to believe they would be vindictive... also what do you do if some body leaves a negative feedback and they are not even claiming they have done business with you - they just think you would be a scammer if u did do business
If you always use a Trusted Escrow. Then, you shouldn't have to worry about this. People with little intelligence realize you shouldn't rely on the trust rating from a unknown person who you don't know anything about. If it's spam talk to a moderator, if not then don't worry too much as a lot of people use their own judgement and nearly 99% of time will ask for a escrow.