To the extent that is correct [0], that doesn't justify reinterpreting “the US should adopt regulations like X” to mean “the Justice Department and not any other part of the US government should adopt regulations like X”.

[0] Its essentially those actions where the DoJ is the agency representing the government interest, including all federal criminal cases and some federal civil cases. Civil cases by other agencies have the agency name; so the antitrust complaint by the DoJ, 15 state governments, and the District of Columbia is United States of America, et al. v. Apple, but the SEC action against Coinbase was Securities and Exchange Commission v. Coinbase, Inc., and Coinbase Global, Inc.