Some of the Indians are students working for “uncles” (because I don’t believe they’re really allowed to work legally), and the merchant caste that sells gas and convenience store stuff can’t work on cars - so they often rent out the bays (and you’ll see another sign over that area). Some just convert the bays to a convenience store; few seem to have working bathrooms...
True, I got off an exit on the Jersey turnpike to go to the bathroom a few years back. I had to avoid the mold, step over the leaks, while fighting off the bugs so my kid could piss. Most disgusting bathroom I have been in. I hoped it was just dumb luck that I used this gas station as is a one-off uncared for bathroom but it may not have been.