What's the licensing of this? I wonder if it could be used to improve OSM.

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To answer my own question

> This base layer of 100mm+ global places of interest ("POI") includes 22 core attributes (see schema here) that will be updated monthly and available for commercial use under the Apache 2.0 license framework.

Found on Simon Willison’s Weblog [0], quoting the official announcement [1]. His page also shows how to use it with Datasette.

[0] https://simonwillison.net/2024/Nov/20/foursquare-open-source...

[1] https://location.foursquare.com/resources/blog/products/four...