https://arstechnica.com/tech-policy/2021/01/biden-treasury-pick-yellen-favors-new-restrictions-on-cryptocurrency/

Cryptocurrencies could come under renewed regulatory scrutiny over the next four years if Janet Yellen, Joe Biden's pick to lead the Treasury Department, gets her way. During Yellen's Tuesday confirmation hearing before the Senate Finance Committee, Sen. Maggie Hassan (D-N.H.) asked Yellen about the use of cryptocurrency by terrorists and other criminals.

"Cryptocurrencies are a particular concern," Yellen responded. "I think many are used—at least in a transactions sense—mainly for illicit financing."