Whats the accepted policy on making apps available in other countries?

I am developing an app that is in English.

If the app becomes profitable, then I can justify the extra effort to do translations for other languages.

But, is it still OK to release my app in the Play Store to ALL countries initially, or should I just limit releasing my app to just certain countries because the app is just in English for now? (And if I should only release just to certain countries for English, what countries would that be?)

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