Yeah, some are available. I'd wager that most aren't.
As an interesting aside, I recently searched for "Michael Crichton" and found that Kobo had a free version of Timeline (sorry, link no longer available). Yeah, I did a double take, but I figured that the author may have donated the rights in his will or something so I tried it out. It wouldn't sync with the reader or the desktop so I tried the 'download' link. It redirected me to archive.org where a message said that the book had been removed due to its content.
My point? I guess Kobo sources some of its books from archive.org and perhaps some of the freebies that are available for download are from there.
BTW: Timeline is still listed in 'My Library' but I'm going to remove now anyway.
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