But you need to register with foursquare to use their feature. I imagine there might be many people who would like this service by itself, not bundled with all

But you need to register with foursquare to use their feature. I imagine there might be many people who would like this service by itself, not bundled with all the foursquare stuff. I think that before you pivot with your product, you should think if you just need to adjust who are your target customers and if it is feasible to reach them.