There’s another free OSM based app that does have some traffic data, it’s called Magic Earth. Not open source though, as their business model is to sell adapted versions.

What does the size of the country have to do with it? Which good big and bad small countries are you talking about?

I think EveryDoor requires some relatively deep understanding of OSM before actually being a useful tool. So edits like this should be rare with that tool. Many of the edits like this are from when MapsMe was very popular and suddenly introduced editing, without enough nuance in the process. Bad edits do happen everywhere, you need a good balance between people who data curation and newbies making beginner mistakes. In some places, there’s a lack of experienced people maintaining the data.

Someone should invent a game, that while playing demonstrates how much monopolies suck for everyone involved (except the monopolist)

“Made unusable”: that’s not how it works. Even with occasional vandalism, there’s so much more people positively contributing, that overall the map just keeps on getting better and better.