> Plenty of people are writing code without being paid for it.

This is rhetorically a non sequitur. As in, if you get paid (X) then you get stuff done (Y). But if you're not paid (~X), then, ?

Not being paid doesn't mean one does or doesn't get stuff done, it has no bearing on it. So the parent wasn't saying anything about people who don't get paid, they can do whatever they want, but yes, at a job if you're paid, then you better get stuff done over bikeshedding.