Excuse my little person for intervening, but I feel people becoming very aggressive, and I don't understand.
I'm not a Patreon, so I don't pay for the authors' work. When an update arrives, I am happy to discover the content of the game (story, X scene, etc). When I see that the update is late, I am sad because I want to see the rest of the game.
Now, those who pay every month, it is normal that they are furious at not getting what is promised.
You say you don't owe them anything. So why not work for free? Without Patreon? Because if you really don't need them, then you don't need their money either. They pay you because they want to see you continue, but if you make impossible promises, or if you can't keep reasonable promises, then it's normal for them to ask you to keep your promises.
On the other hand, I don't understand the Patreons who continue to pay despite their dissatisfaction. When I buy a game on Steam and I don't like it, I stop the fees. I can't claim a refund from Steam, but at least I stop spending my money. And if the game is deleted, or abandoned, why would I be angry? I no longer pay the subscription.
I do not know how Patreon works, but in my opinion, when a Patreon stops paying, a notice must be written, explaining why he stops paying. And make this notice public, so that the next "donors" can know why there are fewer donations. To give weight to the oldest Patreons, it would be good to add in addition, the duration that the person was a donor.
I apologize for my bad english (google)