How old are the people that keep accusing PBMining of being a scam? I assume you were publicly educated since you seem to have no understanding of innocence until proof of guilt.
It wasn't just a guess. From the minute PBMining announced their contracts, many people ran the numbers. It was virtually impossible for them to fulfill those contracts honestly. The only solution was if they were paying old customers with funds from new customers. That's the simple definition of a ponzi. And yes, a ponzi is a scam, no matter where you went to school.