Is the client Uber or the rider? In my corporate job I work with contractors who do full time for us for months at a time. They were paid by a placement agency, but we are the client.
> Meh... this was a big multinational so I doubt they are committing fraud.
I actually think that a big multinational is more likely to commit these kinds of frauds. In fact, a full time employee that works only for one company and who's sent by a placement agency sounds a lot like fake self-employment.
In some countries, Uber has advanced a narrative that driving for Uber is a side gig, with their drivers fitting driving in around other jobs.
This allows them to argue that, for example, they shouldn't have to pay for health insurance or unemployment or sick pay or vehicle depreciation for someone who only works 4 hours a week.
In the UK Uber hasn't made this argument much, as their drivers all have to be licensed minicab drivers - most of whom have driving as their primary source of income.
Plenty of contractors work all day long.