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Such a niche map is something that is very hard to pull of. You need a community of millions to contribute geodata, so if such a map is not based on OpenStreetMap, it is destined to whither after a few years.
But, don't fret. This is precisely why I made https://mapcomplete.org, where you can create niche maps based on OpenStreetMap. This jumpstarts general information but has the possibility to add very niche questions. The added bonus is that, when you add e.g. a cafe, it'll be available in all other maps as well.
For this topic, I've added a filter to filter on 'has internet access'. I also added the question if a cafe offers electricity, but those haven't been marked in NYC yet; so here is a map with all cafes offering internet access: https://mapcomplete.org/cafes_and_pubs.html?z=9.8&lat=40.697...
Browsing can be done without an account, contributing requires an OSM-account.