Most common collections not available for all languages

I was wondering why for some languages (such as Vietnamese and Ukrainian), there are no X Most Common collections, only a Random Collection. This makes it much harder to get started with an unfamiliar language.

Could most common collections eventually be added to all languages, or is it a limitation of the data source?

@DuolityOfMan
The same question was raised on Reddit recently. Please read my answer here.

@MsFixer Great answer, thank you!

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Except - Ukrainian does have wordlists on Wikimedia… this is one of there references: