There was a discussion a few weeks ago where the NSFW instance made it a rule that illegal material would not be removed.
There was then a clarification that if the material was obviously illegal it would be removed but if it was questionable it would be allowed to stay.
This makes everyone that allows NSFW material to show up on their feed open to seeing illegal content.
OP’s question is a valid concern.
There was a discussion a few weeks ago where the NSFW instance made it a rule that illegal material would not be removed.
There was then a clarification that if the material was obviously illegal it would be removed but if it was questionable it would be allowed to stay.
This makes everyone that allows NSFW material to show up on their feed open to seeing illegal content.
OP’s question is a valid concern.