I have Personal license, once I'm ready to release I would like to have a splash screen with my studio name on it. I do not have an llc nor registered as a business. If I sold this game on the app store with said logo and name, would that constitute upgrading licensing too?
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I think not unless you officially register a business. I don't know where you live but there is a chance that you have to register eventually, usually your country wants a cut if you earn money.