Is there any evidence that he knew his seeds or was he just extremely lucky? It is improbable that he's just lucky though, since robbinhood got like 100 greens in a row according to dooglus.
Robbinhood is another case since he actually had two accounts and luckily got the same seed for both of them and actually knew the outcome of the dice. HufflePuff I think was just extremely lucky and got it to 2k BTC. I'm fairly sure Stunna paid him or else Primedice would be down by now because of the accusations amongst it.
Would you be able to quote the source when you said that robbinhood had two accounts and the seeds were the same? How can every roll be the same though, that's pratically impossible except if there's a bug in the pd website.