Quoted from toyotaboy:there's a restaurant in my area that hasn't had a pin for 2-3 years, and has completely changed owners (went from a hot dog place to mexican), but there's no way to delete it.
For locations Robin doesn’t like to delete them for archival and other purposes. However when you search for games the default should search for places with at least 1 game. So closed locations and places with no games shouldn’t show up any longer.