OSM source data is not the same thing as infrastructure owned by OSM Foundation. You can self host maps based on OSM with much flexibility (Though Mapbox is easier to use and now has easy-to-grasp pricing that also doesn't discriminate use cases).

Yeah, freeriders are a problem for OSMF raster map tile servers, but there is now no excuse not to use any of the above two solutions (self hosting or 3rd party APIs).

OSM is data, not servers, which is why a number of companies use OSM data and give you the ability to pay them to use their servers. Thunderforest, for instance.

But the point is that you can use the same data they use to make your own tile server if you like. And if you update the OSM data we will all benefit