Tinder actually has a fairly interesting solution to this, they divide the world up into mile grids and use those. Funnily enough, a blog post by the same write

Tinder actually has a fairly interesting solution to this, they divide the world up into mile grids and use those. Funnily enough, a blog post by the same writer as OPs link. https://robertheaton.com/2018/07/09/how-tinder-keeps-your-location-a-bit-private/ https://robertheaton.com/2018/07/09/how-tinder-keeps-your-lo...