Itch only has a problem with some adult games. Mostly because of things like rape and incest. Those games are still allowed to be sold but they have to use their own account to collect any payments instead of using Itch's account.
That’s not quite right. Like Steam, Itch.io doesn‘t forbid incest or rape. That’s Patreon. Itch hasn’t clarified it’s position, but what we’ve been able to ascertain is that certain games with high return/refund rates were one of the motivating factors, as well as developers who started a new project page with each update so that customers would have to buy the game again being another factor.
There was some inference that developers who elected 0% profit sharing with itch.io (they let devs choose, unlike many other platforms which take a flat 30% cut) were more likely to fall into itch’s crosshairs, but that’s just conjecture.
There are still plenty of adult developers on itch selling their wares and having their funds collected by itch.io, including those that feature incest and rape. Whether they’re on borrowed time or not remains to be seen.