Or someone wasting their time working at one of 10 fast food places that are all right next to each other that no longer has to do that. How much is that job, or even that entire business, really contributing to the economy?

Fast food? Actually, literally feeding people? It's contributing a lot to the economy.

It's not like anyone is going to starve it a few of these places close. Once you factor in the negative health effects and the wasted potential of everyone staffing the place, I think the negative impact a basic income policy would have on the industry could actually be a good thing in the long run.

If you consider top-tier fast food chains have an average gross revenue > ~$2M and profits ~$100K, then that means The vast majority of that $2M is being dumped back into the economy in the form of purchasing supplies, equipment, and labor.

The other benefit for those not employed by or involved in the restaurant's supply chain is cheap and convenient food.