Maybe from this site: https://www.businessofapps.com/data/most-popular-apps/

You can buy reports too.

I couldn't find one with the whole Europe (free), but Italy is still wrong in the image tho.

All places I find seem to point at this source tho https://appmagic.rocks/

Like this page that you would think had their own data: https://www.statista.com/statistics/698982/leading-android-apps-in-norway-by-downloads/

They could also just have looked up news articles for all the countries. Crunch that data haha