Well now that's an interesting development, hadn't thought of that one -- in that I didn't distribute "Magic Catalog" under PG's "free books" license -- because it isn't one PG's "free books".
Well, I just checked it out and its "good news" -- the "author" doesn't actually include "Magic Catalog" in that which he calls "Magic Catalog", rather he just calls his Amazon publication "Magic Catalog" and then includes instructions on how to download the real "Magic Catalog" from my website! ;-) Of course, PG could decide to directly implement this functionality themselves -- direct action catalogs in MOBI and/or EPUB format -- which might help clear up the situation. I would be glad to have PG take this on as a useful contribution to PG readers.