A spokesperson for TfL claimed that this was a "key issue" in the decision not to grant Uber London Limited a new private hire operator's licence after its latest application.
When the company was initially deemed not "fit and proper" to operate in September 2017, a trial didn't take place until the next June, during which Uber was allowed to continue to accept ride requests.
TfL says that it has taken into consideration the changes Uber made to its systems to prevent this activity, but is not confident in said changes and believes it's possible such issues could reoccur in the future.
It sounds like Uber will do just that, with the company's CEO Dara Khosrowshahi publishing a tweet today in which he called TfL's decision "wrong".
In September, TfL granted Uber a two-month extension to its licence with a number of conditions attached. One of these "breaches" allowed unauthorized driver to upload their photos to other Uber drivers' accounts and pick up passengers as if they were verified Uber drivers.
The triple lock, or trinity of licences, which is required for an operator to conduct business lawfully, is met with Uber holding an operator's licence issued by TfL and using drivers and vehicles which are also licensed by TfL.
On the face of it TfL is standing tough against perceived failings by Uber.
Dismissed and suspended drivers were also able to create new accounts to carry passengers.
In an interview with Sifted earlier this month, Bolt chief executive Markus Villig said that he was taking on Uber across the continent by aggressively undercutting it on price and learning from Uber's many, many mistakes. James Farrar of the IWGB union said it would "come as a hammer blow to its 50,000 drivers working under precarious conditions", who would face unemployment while needing to meet auto lease payments. A judge overruled the agency's decision in the summer of 2018 - but then reissued the license for only 15 months, to see if the company made good on its promises to change.
"You and the 3.5 million riders who rely on Uber can continue to use the app as normal". The process is likely to include court action and could drag on for months, allowing its roughly 45,000 drivers in London to keep operating in the meantime, despite the expiry of Uber's license on Monday.
Steve Smith from Brentwood firm 202020 Taxis said: "I am very pleased about that because it is very frustrating for the trade that operate completely against a major company who effectively ignore so many different rules".
In its original decision against Uber two years ago, the TfL said the company failed to do adequate background checks on drivers and report serious criminal offenses.
London Mayor Sadiq Khan, who chairs TfL, acknowledged that the decision "may be unpopular with Uber users" but insisted that "their safety is the paramount concern".
Londoners won't be without Uber just yet.
It has 21 days to file an appeal, which it said it would do.
Uber would have to demonstrate on appeal that it has put in place sufficient measures to eliminate risks to passengers.