I guess I assumed the plan was to extradite to the US, given that his arrest was simultaneous with the US sanctions placed.
Dutch law makes it illegal to conceal or disguise the origin and movement of funds
Sounds like the case against him is much more plausible in his current jurisdiction
To prove that Pertsev is somehow responsible for this activity, prosecutors will have to refute the conventional wisdom that Tornado Cash runs autonomously
…but still completely absurd, if direct control over the concealment of funds is really necessary to convict him. It’s just objective fact that no one but the users had custody of those funds or ability to alter the workings of those smart contracts. Maybe they’ll get him on hosting the frontend, but IIRC they made efforts to have that comply with sanctions? Though it would still be a sort of service for the purpose of concealing funds, in a way.