Feel free to disagree, but I think he certainly benefitted financially from the criminal transactions done on the platform he created. At best he turned a blind eye to it, but just as likely he was fully aware.

Basically all crypto currencies are kept alive by the liquidity that the criminal money laundry brings. Everything else is either peanuts or just holding it for speculation, so if there were not these illicit movements the exchange market would quickly dry up and the value would crash.

So if you are using crypto currencies and especially if you are developing tools to enable hidden illicit money flows through it, you are IMHO complicit in these crimes and very likely also benefit financially from them.