Just found about this happening. Great 😓
I just set up a Newgrounds account(https://sykolgames.newgrounds.com/) and uploaded Sleeping Sister there so it's at least not lost. If Itch ends up banning incest content all-together, which is probably likely at this point, I will be primarily uploading to Newgrounds from now on(unless Newgrounds also gets hit with an incest ban, then who knows at that point).
It's a shame that harmless fiction is becoming so demonized because some people think it's icky. Puritanical bastards.