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.
You could say the same about any regulation, if you cannot manufacture something at a reasonable price without polluting more than allowed, you need to change your prices or adjust your business model.
Out would be better if kfc rained from the sky, but that's not an option.
Why is their business model "poor"? If prices go up, so will what is considered a "reasonable" wage. What's a "reasonable" skillset that an employee must offer to get such a wage.
Difference with pollution, is that its fine to just not pollute. Just not employing makes the situation worse.
Would you be jumping on the chance to supplement your income after a long 8 hour day? especially if i told you that you first needed to buy a shovel out of your own pocket, even though I'd let you dig up to four ditches a day?