Depends on the content, but if not marked as spoiler, they're visible in the homepage discourse for people that hasn't solved the kata yet.

I'm new here so maybe I'm getting it wrong, but isn't a comment of an answer usually a spoiler? I don't suppose the site intends for us to comment lame stuff like "nice answer!" since there's buttons for that.

Please use spoiler flag next time. Your post was visible in the homepage discourse.