NSFW Content hasn't been removed. It's just somewhat more hidden than it already was. Nothing more than that. And even with that fact the reason why it was really bad was because there's not necessarily a website like itch.io but for NSFW Content, and really harmed the devs with Itch.io was a safe space for.
Plus the Site already hid nsfw content unless you had an official account and actively searched the tag to keep younger audiences away from such content. In general more harm was done for that section than good, the site wasn't really designed for younger audiences in the first place anyways.
I'd say there should just be a few more hoops that people should go through to access NSFW Content, rather than unexpectedly remove and shadow ban it with little warning and actively hurt the devs since little warning was given.
EDIT: I may be incorrect on there not be many other indie dev websites for NSFW Games but I could be very wrong since I haven't looked into that.