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And they contribute back to the project, right? Right?
Just switching by itself is a huge contribution.
And I also think they pay to use it, since commercial usage is not free.
since commercial usage is not free
Commercial usage oft the osm data is free, see the OSM license. The article even speculates that they switched from Google maps due to licenses costs.
Of course this doesn’t apply to commercial services that provide e.g. map tiles.
OSM Germany is absolutely detailed. Honestly, german contributors could spare some time mapping in other countries.