Also, the bit you mentioned about not blocking robots except for pressing legal reasons? That's a little bit odd. Robots are terrible from a website maintenence point of view, because they can - in some cases, dramatically - increase the load on a site. Not to mention that anyone who writes fanfic - especially erotic fanfic - and doesn't think they're operating in a legal gray area is likely someday going to be very, very unpleasantly surprised. I'd start from the assumption that anyone blocking robots has a very good reason to do so, legal or otherwise.

Personal archives - i.e., a reader's hard drive - are one thing, but not wanting to participate in a public archive for one reason or another and taking steps to do so seems perfectly acceptable to me. If you don't want to participate in personal archives, well then, for God's sake, don't post the story. That one isn't likely to get much sympathy at all from me.