Is there anything in judgement that limits this to cryptocurrency?

I could see this precedent being used to shut down open source projects in end-to-end encryption, BitTorrent, etc.

While I have no knowledge of Tornado Cash itself, I hope an organization like the EFF would help appeal this to mitigate the larger danger. I believe there are precedents that publishing source code is protected under the first amendment (code is writing).

This is distinct from operating a service.