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12,872 patrons * $12 = $144,000 per month.
$144,000 * 12 months = $1,728,000 per year
And that fucker has been doing this for several years now. So regardless of how much Patreon and Uncle Sam take out of that revenue, he's filthy rich by now. And he has no intention of ever releasing the game. These are the most extreme numbers though and it's likely most of his Patreons are only giving $1 per month but still that's a lot.