To be fair, this was when they were just coming into London and offering crazy bonuses to steal market share from Deliveroo, but still, this isn't controversial - if someone pays you bad wages, don't work for them...
If you can't find work elsewhere, you'd rather work for pennies than for nothing.
In the article the author tries two options: Uber Eats and Foodora. So, yes, in theory there are probably some people who would rather have the Uber Eats "work when you want" schedule rather than Foodora's but that very much falls within the realm of what fastball was suggesting with "if someone pays you bad wages, don't work for them."
Just because you don't value that type of flexibility doesn't mean someone else won't value it. It seems like the more options there are for people looking for jobs the better.