So, can't the developers make money without someone donating or paying for the game? I want to ask one more thing, if we have earned money, how can we see how much we earned?
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So, can’t the developers make money without someone donating or paying for the game?
No. Where would that money come from? itch.io is already hosting these games for free - which costs them about a five digit sum per month, regardless of actual sales made. Publishing indie games is hardly a goose that lays golden eggs - same goes for developing them…
As for seeing your earnings: “Creator Dashboard -> Payments”, I believe.