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I had site similar to this that generated 600-700$ USD per month as passive income.

I didn't touched it, sometimes for many months in a row.

Aw, I thought this would create a wikipedia-style entry for a fictional non-existent country!

How does this make money? I don't see any ads.

They said a site similar - Not that this is theirs.

Not the OP, but if you search for "random country generator" you will indeed find a few similar sites which do definitely have a lot of ads.