It is still unsure if this will trigger dumps, people may start using some other platform far from the reach of regulators.
Tether has yet not frozen accounts but USDC did. However, we are not also sure how reliable the information coming from tokenist.com.
Consequently, all Americans and US-based entities are barred from interacting with Tornado Cash or any of the Ethereum wallet addresses tied to the protocol. Those who fail to comply may face fines of $50,000 to $10,000,000 and 10 to 30 years imprisonment.
I have not used Tornado but the list is a lot.
USDC banned addresses -
https://dune.com/phabc/usdc-banned-addresses