They can’t do so automatically. Osm Editors must approve. Apparantly OSM fears legislation when people copy info from google maps. They like to see evidence, like street sign photos. In my limited experience anyway.
yet google was caught red handed stealing openstreetmap data for years and all it led to was a timid Ooopsy letter.
the real reason is that user content, either you don't have anybody contributing, or you're flooded with abuse. there's no middle.
I occasionally contribute to OSM. You just send your edit and they are directly live. I don't think there's prior moderation. On these apps you log in to OSM using an OSM account IIRC (though I mostly use EveryDoor or directly osm.org for this, occasionally StreetComplete, I don't contribute using Comaps)