they are legit, but they still never say or show physical mining location.. lol.
They are not legit if they refuse to show us mining location, photos of equipment and such. They have something to hide = I can't trust company like that.
They do a pretty good job mixing
Which is proof they're a ponzi. Yes, mixed coins are hard to track. Actually mined coins are impossible to track. They have no history. Mixing is proof they are not mining as much as they say they are.
Another reason to be mindful and step back. There are too many hints that suggest PB may be not so trustworthy in the future if they continue to work like that.