So we go from a few people scamming a few vendors , to a few vendors scamming a lot of people 
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Each system has its advantages and its disadvantages , that's why we have lots of payment processors.
.Each system has its advantages and its disadvantages , that's why we have lots of payment processors.
The second case is much worse than the first. If we can't prevent this particular problem, then Bitcoin will never become popular with people who sue them to purchase various products online.