That’s what I thought also! It does actually filter the posts (I’ve checked), but I’ve received reports and DM’s from people telling me that it’s missing the NSFW tag. Some people enable NSFW in their settings and then get shocked when they come across an unmarked NSFW post. I do get their point of view though with clicking on something not marked as NSFW and seeing NSFW material.

I’m still new to Lemmy, but I’m not understanding the point of a community mirroring on different instances. If you’re on one instance, like sh.itjust.works, I thought it’d be discoverable on all the other Lemmy instances. I would never see a point in creating multiple instances of the same community if one of mine were discoverable by All.