Previously, single purchase still allowed us to keep up-to-date with the game without a monthly sub, something I couldn't and still can't afford. Will there be an alternative single-purchase option? Preferably not Steam. GOG for example also offers adult games including well-known AVNs like BaDIK
The system on Itch has always been like this—one purchase and you'll receive all updates. In the future, we plan to release on Steam. GOG does have some NSFW games, but the selection process there is incredibly odd and difficult—there's practically no chance we'll get in, but later on, we'll definitely give it a try.
I'm sad that Steam is the only platform you'll release single-purchase on in the future, but I suppose there's nothing to be done about it. I do know that someone has been working on a platform for adult games since the while Itch/Steam payment processor debacle that you might want to look into, but I can't think of the name top of my head right now. Hoping someone else that remembers could comment the name.