I'm not sure if the number is accurate but I do know how amazingly stubborn humans can be in finding a new job. I've had people refuse to quit a job that they groan about every day when I've offered them almost double the salary to work elsewhere with far better terms.
Humans are risk averse and those who live paycheck to paycheck are especially so. It defies logic until you consider that their fear of the unknown + small chance they end up with no job has a massive adjustment weight applied to it in their minds.
It has a massive cost if it doesn't work out too. We're talking about an income bracket that could miss, say, one credit card payment minimum then due to a raise in the minimum for missing, probably miss the next. Situations like this are posted on reddit.com/r/personalfinance all of the time.
It's the same reason municipalities are dropping jail time for unpaid fines, etc, as hourly workers that miss one day of work unexpectedly are often fired and then end up in even more financial misfortune.
I've never met a lyft/uber driver who did it full time. Most of the people doing it need the work but can't manage committing to adding a full third shift to their life on top of their other job because they have kids/a dependent/class or just got laid off and are trying to stretch their savings while looking for work, and need the flexibility.
You're applying a healthy dose of rationalism to this. I don't have the answer but I think there's a possibility that you can't expect rationalism when you're asking people to walk away from the major pattern in their life which puts food in their kids mouths.
Humans are risk averse and those who live paycheck to paycheck are especially so. It defies logic until you consider that their fear of the unknown + small chance they end up with no job has a massive adjustment weight applied to it in their minds.