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"first month" is really obscuring the decade or beforehand. That's 20 years of development before the premium version launched

It made an additional $23 million after the first month.

So that's 360K/year over 20 years?

And a lot more from subsequent months, but I don't think it's a problem that this wildly successful videogame made its developers decently rich.

Oh I fully agree. I hope Tarn an Zach make millions more and can keep working of their life's work for many years to come.