A blog like one of mine (or those of probably most others) that isn't "public" is pretty useless. Blogs no longer attract followers since newer forms like Facebook and Twitter (and Google+) have taken over the "friend" and "follower" concept. Blogging, as such, could decline, or at least retreat to being part of flat sites with a lot static material, always hosted. Perhaps a small number of companies could make "private blogs" devoted to sexually explicit material work with "membership" requirements, but normally they would to this with their own sites, not free blogs.
As an added note, I see in the Forums that "Nitecruzr" gives some general guidelines on content complaints (adult classification), at least through 2014. I suspect he will add some more material to this soon.
Note (Feb. 27): The "no porn" policy has been deferred. See the product forum mentioned in the Feb. 24 posting.