Good question.
Right now, due to payment processors threatening to pull itch’s plug if they don’t like the NSFW games hosted on it, itch is currently de-indexing ANY nsfw games that can be paid for, or are open for donations. The game is still there, but cannot be searched for by name nor tag. I want OPP to be findable, so I am not offering a paid version on itch for now.
If itch changes back to the way things were, or declares OPP “clean enough” to be searchable and payable at the same time, I will offer the paid version on itch. Whether or not that will happen is murky right now. I know that itch is fighting for us nsfw creators, but their power is limited compared to Visa and Mastercard threatening to cut off their ability to process payments.