Exploitation isn't when somebody is forced to do something, it's when one person profits off the work of another. So in my example, the job is exploitative, yes. Having a business fail is not exploitation.

I didn't make an argument about whether it was contributing to the economy or not, but that doesn't matter - slavery contributed to the economy too, but it's also morally wrong.

It's a stripped down hypothetical on purpose, to get to the heart of the question. Non-labour material concerns are left as an exercise for the reader.