There is of course no threat of homelessness or starvation and those that were unemployed could have "chosen" to remain unemployed rather than taking those gig employment offers.
Also as per your example, clearly everyone that started working at Uber knew they had to take into account costs such as the replacement cost of their vehicle, higher maintenance cost due to a huge increase on average kilometers driven per month, higher insurance costs, cleaning and repair cost to seats due to higher usage, etc.
If people could choose to not work and not starve/lose their home I would somewhat agree most of those picking up employment as pauperized gig workers would do so willingly.