Tornado Cash Sanctions

Tornado Cash is in the news due to the sanctions imposed by the US government and the freezing of $75K of USDC from Circle. The addresses tied to the service have been publicly posted online. (Hint: we also have them in our crosschain address labels table as well). What is Tornado Cash and why would it be targeted by the US government? Why might an address interact with the service? The addresses tied to the service have been publicly posted online. Using those addresses answer the following: How many addresses are still using the service despite the sanctions? Which addresses have been interacting the most with Tornado Cash? Break the addresses down by frequency and volume of tokens and describe how the groups are using the service differently. Is there anything else interesting about its users?