I believe the standard license is a one-time fee of 2 bitcoin. FWIW, I don't think it's actually too big of a deal -- all things considered -- copyright violation is pretty minor. Had Dean just said: "I don't believe in copyright law, so I have no intention of following it" -- I'd probably think it's a reasonable enough position.
However, the whole thing revealed that Dean has absolutely no problems in blatantly and provably lying just to save 2 btc (after supposedly raising millions in an ICO).
And actually, it's how the mini-feud between me and him started. Previously I was on good terms with him, and helped him out with things numerous times. He told me he was using the bustabit code on both the server and client. I recommended to him that he should just follow the AGPLv3 license (as it's pretty reasonable, and free!) or just pay Daniel for a license. I also said something in confidence like: "if Daniel doesn't realize, you can probably get away it" (although I did emphasis it's best to do things legitimately).
Then Dean went behind my back, and misrepresented what I said and lied about me telling him he "can do it". (something that even if wasn't a lie, I wouldn't have the rights to do anyway).
That's when I realized something was _seriously_ wrong. He had no problems provably lying and burning personal relationships just to save a couple bitcoin. A casino is built on a trust, and Dean has proven (now several times over) that he can't be relied on to always be honest or do the right thing. It's no wonder his casino has virtually zero volume left; all the smart money knows to stay far away.