I think taking this matter to Itchio and the discord was a very bad idea...
Piracy is everywhere and there is a reason many artists and VN creators don't talk about this on social media.
In my country, there was an anti-piracy propaganda airing on tv years ago. Instead of preventing piracy, it backfired badly. More people got to know that you could get content for free on the internet and piracy became even more popular.
The best thing you can do is just ignore it, and silently make up ways on Patreon that make difficult the share of the game's files. I don't know any methods myself, but I think some people that already dealt with this problem might know.
The transparency of your situation is very appreciated, but more people with malicious intent will take advantage.