Yes, Foursquare and Overture places are like many geolocation-centric datasets: users aren’t supposed to ever see the raw data, either in a list or on the map. You have to filter by a confidence score. Otherwise, you’ll get tons of user-generated junk – pranks, mistakes, etc. It’s probably even messier than Overture in some places, because Foursquare was essentially a mobile location game for many years.
This kind of data is more readily consumable in a geocoder than on a rendered map. In the past, Foursquare would charge big bucks for the confidence scores as an upsell. If these scores aren’t part of the dataset, then no wonder the company feels comfortable releasing the data.
Here’s a marketing idea for OSM: publish a dataset of all the POIs that have ever been added to OSM in any form, including deleted ones, and tout the relatively huge total number of them with an asterisk that refers to an OSM confidence score and the URL to a forum thread where we bikeshed about what that confidence metric should be. 
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