What's on the itch, what's on the patreon, you actually get the patreon code once for one version of the game. However, it also happens that one patreon code can act on several versions of the game at once. This happens rarely and only when someone don't puts patreon code on public forums. Accordingly, the thesis comes out of this: we change the patreon code in the game only when those who did not pay for it find out about it.
We would give away the it forever, but, unfortunately, this is simply impossible.