Citadel Securities urged the U.S. Securities and Exchange Commission (SEC) to take a cautious approach toward decentralized finance (DeFI), arguing that certain systems dealing in tokenized U.S. equities may resemble regulated market infrastructure and should be evaluated accordingly.

The crypto industry took to social media to express its outrage after the Dec. 2 letter, submitted as part of a consultation on how federal securities laws should apply to crypto trading platforms, became public.

The SEC, widely viewed as skeptical of the crypto sector under former Chair Gary Gensler, has taken a more conciliatory approach since President Donald Trump's return to the White House. Under Gensler, the agency argued that most digital assets fell under existing securities laws. His tenure set the tone for a more confrontational regulatory landscape, particularly toward DeFi.

In its letter, Citadel said many automated protocols bring together buyers and sellers in ways comparable to traditional exchanges, even if the mechanics rely on smart contracts rather than centralized operators.

As these systems can execute trades using preset rules, Citadel argued they may satisfy definitions tied to exchanges or broker-dealers, particularly when they facilitate transactions in securities-linked products.

Citadel also said any regulatory relief should come only after a clear examination of investor-protection implications, warning that inconsistent oversight across tokenized and traditional markets could lead to gaps in transparency and compliance.

The crypto community erupted on social media. Uniswap creator Hayden Adams criticized the submission, saying it effectively sought to treat open-source developers as if they were centralized intermediaries.

He also pushed back on Citadel’s claim that DeFi cannot guarantee "fair access," arguing that permissionless protocols expand, rather than restrict, participation.

Crypto policy expert "BlockProf" added: "Citadel just declared war on project crypto, taking up arguments made by Gensler in his failed attempt to regulate DeFi and attacking the points made by Commissioner [Hester] Pierce in her dissent. The opposition letters will be extensive stay tuned."