Eh hypothetically if it could be proven that DC spent the money on an absurd amount of cocaine, it'd be a fraud case and possibly a class action could resultNot sure how or why you'd report it here on F95? This site isn't to blame if the game is a scam.
Or do you mean report on Patreon? Not sure that's helpful either, Patreon as a site is pretty clear about its stance that your pledges to a creator are just donations and aren't commercial exchanges for any expected product. Even if a game is the most obvious milking ever, from a legal perspective it's not a scam because you technically were never promised anything in exchange for your pledge (except maybe some perks like access to locked posts or streams).
About the only thing you can do if you decide a creator you've been pledging to has rugpulled you, is to take the L, call it a learning opportunity, and move on with your life. There's no recourse. That's by design.
But yeah idk why people have donated for years when there's no incentive to ruin the cash cow