It doesn't matter for the users at all, of course. But I'd think that phone booths have a few benefits that makes this a good idea.
For one thing, there's a phone connection right there. I imagine that they would plug into this for the hotspot.
Plus, they don't have to figure out where to put the hotspots: just use the booths, period. It would probably make the deployment simpler and faster.
Also, the overall coverage will most likely not be perfect, so the booths are a visible structure to get close to if your signal is weak (as opposed to try to spot a standalone router for example).
For one thing, there's a phone connection right there. I imagine that they would plug into this for the hotspot.
Plus, they don't have to figure out where to put the hotspots: just use the booths, period. It would probably make the deployment simpler and faster.
Also, the overall coverage will most likely not be perfect, so the booths are a visible structure to get close to if your signal is weak (as opposed to try to spot a standalone router for example).