However that practice, which underpins the gig economy, has increasingly come under legal attack in many countries.
In Wednesday's ruling, the French Court of Cassation rejected Uber's appeal against a 2019 decision that found a former driver who sued the firm effectively had a work contract.
The court found that Uber BV had control over the driver by his connection to the app which directs him to clients, and thus should not be considered an independent contractor but an employee.
"This is a first and it will impact all platforms inspired by Uber's model," said Fabien Masson, the lawyer for the former driver.
The ruling does not force Uber to automatically sign contracts, and drivers will be forced to go to court to obtain requalification as employees.
But for the estimated 150 Uber drivers who have already filed cases, "these drivers will benefit from this ruling", said Masson.
Another lawyer who represents a dozen Uber drivers, Kevin Mention, said the ruling will eventually put the gig economy model at risk in France as it clearly described practices that are common to all firms that use it.
"If they don't change their model today they are heading straight for the wall as it is certain qualification" for those who challenge their status as contractors.