How is a service that's "fully decentralized", not have an option for a tor version or even have an option for one to run their own node and run a network of a censorship resistant decentralized service? I mean as soon as the sanction came into play, the main website went offline, default RPC protocols blocked, GitHub deleted, etc
Tornado Cash's contract is still up and running, that's where the decentralization comes from. You could claim that it's too hard to run your own Ethereum node and host your own copy of their frontend, but that's still possible.