You are way too nice.
Technically, you paid for it. In essence you could do what you want with it. Print out the renders and use it for toilet paper, fire starter, tissue paper, spread it around town, etc.....
Paying for art doesn't necessarily mean owning it. If I buy a book I can loan it to a friend, but if I print my own copies and sell it, or even just post it for others to read, most of us would understand why the author/publisher would be unhappy. Having said that, it does seem a bit funny for DPC to allow the entire game to be downloaded and played for free on this site, yet he blocks a Patreon supporter because of a leak of a single preview. I get that DPC wants to be in charge of his own marketing, and that during development he wants to ensure that supporters at the higher tiers get rewarded for their additional support, but the response does seen harsh. I wonder if he has explicitly stated in terms of service or rules or whatever for his Patreon that sharing content is strictly forbidden. If he does, then banning someone for violating them may be something we don't like, but the patron can't say he didn't know.
I support DPC at the $10 level but raise it to $25 in the month when a new episode comes out, so I can play it right away. If I add up all the money I've donated to DPC, plus my purchase of the game on Steam, Being a DIK is by far the most expensive game of my life. But I don't view it as the purchase of a game. I view it as supporting an artist in a way that helps him to be free to pursue his craft (and I REALLY enjoy his craftwork). I support other artists on Patreon, as well (not AVN artists; DPC is the only creator of adult content that I actively support--for now, at least) for the same reasons.
In an ideal world, according to me, high-quality content like this would be available for sale and everyone who wanted it would buy it, and there would be no need to provide patronage of this sort to developers, but we don't live in an idea world. And, as we see here, there are artists whose work is less commercial--think people who create those short lewd animations or individual lewd renders--who would virtually never see any financial reward for their efforts outside of a patronage-type system.