[dkh]

Not involved with this project, but there's a couple big reasons most would care about this.

* Child porn and similar content that is a level beyond simply "NSFW"

* Uploaders of NSFW stuff are always in need of a new platform they haven't been kicked off yet, and newer platforms are likely to be dominated with this type of content. Unless you want your platform to gain a reputation as the place for mostly NFSW content, you probably don't want this.