HSBC was likely still in possession of the records created by GAAP, and thus could reveal another set of links in the network of money movement. They had a barg

HSBC was likely still in possession of the records created by GAAP, and thus could reveal another set of links in the network of money movement. They had a bargaining chip. Tornado.cash does not. Also, if you haven't noticed, nation states tend to come down like a ton o' bricks on high-tech facilitators of criminal activity, the idea being that by implementing that bit of infrastructure that made all of the criminal activity you have facilitated easier, you have substantively participated in all those crimes. I'm not saying that's okay, or how it should be, but look at Aaron Swartz, Alfred Anaya, McAfee, Assange... It's the same pattern. You will be made an example of as a warning to others.