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It's not clear to me in the article: which version of MAPS.ME was forked? The latest version 1 from end of 2020?

Also, I didn't know MAPS.ME had been open source since 2015!

https://github.com/mapsme/omim/ was forked in December 2020, with all new changes up to the last commit of Apr 28, 2021 merged into https://github.com/organicmaps/organicmaps/ later. MAPS.ME is alive, but they publish the source code anymore since that.