Oh wow, TIL there is finally a simple way to actually view OpenStreetMap! Gosh, that's overdue. Glad it's done though!
The OSM Foundation has been serving raster tiles for years and years (that's what's visible by default on the slippy map at www.openstreetmap.org): https://wiki.openstreetmap.org/wiki/OpenStreetMap_Carto
After on and off experimentation by various contributors, OSMF just released vector tiles as well: https://operations.osmfoundation.org/policies/vector/
... And then it became 1M rps!
What was wrong with the main site? Genuine question https://www.openstreetmap.org