Not sure where you got that info for, but reviews are hard to fake, since you can check out the buyers profiles and see their activity. You can also check out gig sellers level, which would be almost impossible to fake, since you have to actively reply, finish gigs and earn certain type of income. People mostly get scammed by sellers that have no reviews and showcase someone else’s work as their own. If you go with a seller that is at least level 1 with at least 10-15 reviews, it would be pretty safe and for extra security you can also start with a cheap gig and see if they can finish it in a satisfactory way.