If a gig worker reguarly goes to multiple grocery stores (which is pretty common, moreso than for individual shoppers), there might not be much benefit for grocery store workers. The ability to transfer disease between grocery stores might increase risk in a major way. It's also not clear that interacting with one high-risk gig worker is better than interacting with twenty low-risk remote workers.

I'd be wary of coming to strong conclusions here without data; you can easily come up with plausible arguments either way.