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.
E.g., OrganicMaps often creates these kinds of notes: https://www.openstreetmap.org/note/5377887 which for certain kinds of edits is safer than trying to directly edit. StreetComplete does the same in many cases when something no longer exists. I think, shops and other places can often be added directly, though since that has little to no ties to existing data.
But yeah, I'm using mostly StreetComplete (SCEE) when outside, sometimes Every Door and Vespucci. For offline map apps like Organic Maps it's likely not easy resolving potential conflicts with live OSM data that might be weeks or months newer than the map data in the app.
In batches, to be exact. Multiple edits in relatively short intervals (a few minutes) are commited as one.
the real reason is that user content, either you don't have anybody contributing, or you're flooded with abuse. there's no middle.