For three and a half years, the messaging platform Telegram has served as the home of a sprawling black market known as Xinbi Guarantee, an anarchic, Chinese-language bazaar offering money laundering services to crypto scammers, products like electrified batons and tasers for those same scammers' human trafficking operations, and even at times other assorted criminal services ranging from harassment-for-hire to teen prostitution. Despite WIRED and crypto crime researchers repeatedly pointing out that blatantly criminal activity to Telegram, the company has since allowed Xinbi Guarantee to grow into the biggest black market on the internet, one that's facilitated a staggering $21 billion in total transactions.

The full extent of Telegram's failure to eradicate the scam marketplace was put to the test late last in March when the UK government officially sanctioned Xinbi Guarantee and designated it a facilitator of human trafficking. Yet now, nearly three weeks later, Telegram still hasn't removed Xinbi's accounts on its service, facilitating more than half a billion dollars’ worth of illicit deals in the time just since those sanctions were put in place.

According to cryptocurrency tracing firm Elliptic, Xinbi Guarantee carried out $505 million in transactions in the 19 days after the British government's sanctions and added tens of thousands more users to reach nearly half a million buyers and sellers in total. Elliptic says it has seen no signs that Telegram has taken any action to ban the market or its accounts. “Xinbi is still going strong,” says Elliptic's cofounder and chief scientist Tom Robinson. “They're on track to become the largest market of this kind that's ever existed.”

Telegram's apparent refusal to remove the black market—just one in an industry of Chinese-language black markets that operates on Telegram in full public view—represents an appalling lack of accountability, says Gary Warner, a security researcher who has tracked Xinbi Guarantee as director of intelligence at the cybersecurity firm DarkTower. “It boggles my mind,” Warner says. “There's literally no legitimate company in the world that hosts this level of criminal activity and is so open about it. There's nothing that even comes close.”

Telegram didn't respond to WIRED's multiple requests for comment on its hosting of Xinbi Guarantee following the UK's sanctioning. In June of last year, however, a Telegram spokesperson justified Telegram's hosting of Xinbi Guarantee and other Chinese-language black markets by arguing that they allow Chinese citizens “to seek alternative avenues for moving funds internationally” despite China's rigid financial controls.

“We assess reports on a case-by-case basis and categorically reject blanket bans—particularly when users are attempting to circumvent oppressive restrictions imposed by authoritarian regimes,” read Telegram's statement to WIRED at the time. "We remain unwavering in our commitment to safeguarding user privacy and defending fundamental freedoms, including the right to financial autonomy.”

That description of Xinbi Guarantee as an innocuous “alternative avenue” for international money transfers had already been undermined by Elliptic's findings that Xinbi was predominantly used as a money laundering service for the vast crypto scam industry, including Chinese-run organized syndicates that control compounds across Myanmar, Cambodia, and Laos that enslave hundreds of thousands of human trafficking victims forced to work as scammers. Elliptic found listings as recently as the past month that offer products that appear intended for those human trafficking operations, including electrified batons, tasers, and handcuffs.

On March 26, the UK's Foreign, Commonwealth and Development Office officially sanctioned Xinbi for its alleged role in scamming and human trafficking. “Xinbi has enabled and profited from the operation of scam centers in Southeast Asia,” the sanctions notice read. “The treatment of individuals in these scam centers amounts to a serious abuse of the right not to be subjected to cruel, inhumane, or degrading treatment or punishment, and of the right to be free from slavery, not to be held in servitude or required to perform forced or compulsory labour.”