Synup adds/submits all the location information that is added on the dashboard to all the partner sites supported for your respective location regions.
However, sometimes the partner sites themselves have various restrictions, which we cannot over-write. Added below are the parameters submitted on Foursquare and the restrictions proposed by them.
Note: Foursquare no longer accepts ‘service area businesses’ (businesses without addresses), The Foursquare community will flag your account if they continue to find these types of venues.
Good places - Real places or real events. Places where people can meet up or like to spend some time. Places for which a Foursquare category exists. Places where people like to check-in.
Bad places - Places that don't physically exist. Listings where check-in isn't possible (online or virtual businesses, SEO spam).
Here is the acceptable categories list by foursquare.