It doesn't go into effect until 2027 at least:
The US Treasury has finalized its "broker rule" to go into effect in 2027, regulating the use of non-custodial trading services – or so called "DeFi" – establishing that custody over funds is not necessary to be considered a broker by the IRS.
Is someone going to tell them that front-end services can be provided by the end users themselves?
A "DeFi front-end service", according to the final regulations, can be defined as "screens, buttons, forms, and other visual elements incorporated in websites, mobile device apps, and browser extensions—that users can use to trade digital assets in their unhosted wallets".