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If you go to https://itch.io/tags and scroll you will start seeing NSFW tags.

(+2)

Yes, you can see the tags, and the games in them, but the game pages themselves will show an age check if you click through. Arguably the mouse-hover popups leak information, but that's another story.

(+1)

But the thumbnails of games tagged as NSFW is shown By-default from the tags page. A better solution would be to blur them, or better yet don’t show NSFW tags unless the user opts-in to show NSFW content

I think there are requirements to not show any adult content in thumbnails though, so why would that matter? I strongly dislike opt-in because it limits visibility to the adult audience as well, many of which do not log in when incognito, etc. Thumbnails are the advertisement, blurring them is making a judgment call on what content should be advertised. The age gate when you click should be plenty.

Admin(+3)

Thanks for the report. This issue should be fixed now. NSFW related content and tags will now only be eligible to appear on tags that are already marked as NSFW. Additionally, tags that are explicitly marked as NSFW will not show up by default unless the viewer has opted into them.