Who is "running" the code?
The US government, to this date, has not made an argument that the developers of Tornado Cash, who have deployed the code to the Network, have committed a crime; at least one of them seems to be living in the US.
Nor has the government made an argument that operators of Ethereum nodes are committing a crime; they might also be considered to be running the code.
What the government has done is, through sanctions, instituted restrictions on Americans interacting financially with the smart contract. This has nothing to do with "running code"; this is operating under the assumption that the Tornado Cash smart contracts are an entity that is party to financial transactions.
Whether they have the power to sanctions non-entities like a smart contract is what the suit intends to find out.
[0] https://www.trustnodes.com/2022/12/14/70-of-the-ethereum-net...
However, actually running the code to facilitate North Korean hackers launder money and personally profiting off of it? That's not covered by the first amendment, and I sincerely urge you to not try to find that out in the hard way.