Maybe they got data from other sources that they combine with the osm data.
OpenStreetMap community
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Join OpenStreetMap and start mapping: https://www.openstreetmap.org.
There are many communication channels about OSM, many organized around a certain country or region. Discover them on https://openstreetmap.community
https://mapcomplete.org is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.
OSM has a lot more data inside than the website shows - in dense shopping areas you can't zoom in far enough to see all the POIs, much less business names.
I've read before that using cached previews was done to stay accessible to less-powerful mobile devices, which would have smaller CPUs that would be taxed by rendering the native vector data. I view it as a branding disadvantage that OSM appears, from desktops, to have less info than alternatives. But that's a battle that's been had many times before, one might as well argue over paper vs plastic.
They’re currently working on vector based maps for openstreetmap.org
Thanks! I didn't remember where I've read that.