Uber is especially weak to negotiation because you can just drive less or switch to Lyft.
If a poor person has two income sources, either source is less essential than if he had just one of the sources. The less essential the pay from the Uber gig, the less Uber can squeeze the worker.
Without the work requirement, you're actually helping people.
The reason we have it partly that welfare recipients literally don't like getting welfare without strings attached because they think it's embarrassing (or that the other people getting it don't deserve it), and part that states are hoping to save money by kicking people off for doing the paperwork wrong.
EITC is a way to do "work requirements" without the downsides.
In this way welfare is actually subsidizing Uber employment. Assuming of course, that welfare is also insufficient to survive.
https://www.cnbc.com/2020/11/19/walmart-and-mcdonalds-among-...