Glad you already learned this is probably nonsense. The wrong reasoning is very similar to much thought about overpopulation. The amount of people that makes for a place to be overpopulated is a function of how societies work and the technologies they have at hand. One extra issue there is that improvements in technology usually lead to population growth, so much progress gets cancelled out.

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.