I am developer of adult games, Itch.io does not delete my games but if they hid them completely, you can only access my video games by direct link. It should be clarified that none of my games have incest themes.
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Consider open a patreon alternative (I didn't do it at time), because when I've got the shadow ban here, Patreon deleted my account shortly after, also them don't care about 'incest', none of my games have such content and got deleted, but other games where incest was the focus, still are available (seems that they want to 'farm' big developers as long as they can).