All these apps rely on the data provided by OpenStreetMap (OSM). It is a Wikipedia-like project where anybody can contribute edits.
Would it be more accepted to just do a few small, potentially not metadata-complete edits myself or is the review structure (if there is any) geared more towards fewer, more steady contributors?
Did one direct edit once and iirc it took ages to land in the map and I wasn't able to grasp if came from new editors' edits being scrutinized more carefully by too few reviewers, from the nature of the edits (deleting a bunch of buildings after demolition and probably not replacing it with the right area type) or if the release cycle for new edits to be included is just way longer than I would have expected.
Different maps have different update cycles. The slippy map on osm.org is meant to update as quickly as possible, usually a few minutes, but sometimes there are hiccups. Zoom levels that show larger areas also update a little slower.
As long as what you are adding is up to date/accurate, I wouldn't worry about whether you've captured everything about the features. "This thing is here" is a lot better for the map than no information.
What StreetComplete is very good at, in my opinion, is simply QA on the ground. SC asks about features existing on the map (benches, bus stops, shops, roads, barriers, etc.) and some of them might go stale. So asking about opening hours of a shop might cause someone to look and notice that the shop is closed now, or replaced by another one, so in many cases the quests that add detail to objects have the nice side-effect that those are being looked at and reviewed whether they still exist, which otherwise does not happen often. The barrier to adding new data is often lower than fixing or removing outdated information.
And it's such a low barrier to entry, especially for people not familiar with OSM's tagging, since the UX is very well designed for beginners in my eyes (while still being useful for advanced mappers), that you can easily recommend it to people who like those kind of hobbies (e.g. geocaching, Pokémon Go). For me it was an excuse to go outside more, also to places I haven't been, during COVID-19, just to tick off another quest.
insanely shameful if not
the real reason is that user content, either you don't have anybody contributing, or you're flooded with abuse. there's no middle.
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.
Do you have the slightest idea what OpenStreetMap is and how it works? It sounds like you have absolutely no clue, and it still doesn't prevent you from using that kind of language.
CoMaps forked out of OrganicMaps after a row about money
The hardest thing about any effort that is two or more people is the interpersonal, coordination, consensus, and organization aspects. Everything else is easy in comparison.
If they have to negotiate, constantly settle, and get no money, that's a hard sell.
Organic Maps is organized as a for-profit entity. CoMaps is not. This is a real difference, and the former asking for donations makes it look like a scam.