I've looked at them more closely -- the first two have "About" pages (
here, and
here) that explain that they're only interested in legal books, and the fourth one is the author's
own blog, the third one is, of course, yours and I don't see anything there either.
Are you looking at the text-to-speech application that the second site has an ad for? That's the only thing I can see that you
might be talking about.