Foursquare are releasing Foursquare Open Source Places as an open data set, to be updated monthly under the Apache 2.0 license. Pretty big news for the geospatial and location data folks. https://location.foursquare.com/resources/blog/products/foursquare-open-source-places-a-new-foundational-dataset-for-the-geospatial-community/
... if you were, say, to think about rebuilding something like Foursquare as a member of the Fediverse using ActivityPub, like this person @Edent has done, this might be an interesting time to do something innovative. https://shkspr.mobi/blog/2024/01/rebuilding-foursquare-for-activitypub-using-openstreetmap/