I've gotten a lot of bookfunnel books (and another service like that I can't remember the name of), and they're putting them out that way for advertisement and to get eyes on their newsletters. Some are books that have been free before, or may be free in the future. Some are short prequels that may be for subscribers only.
I've always thought it was very clear that you had to sign up, and you could always unsubscribe.
I have an extra email addy I just use for those kinds of books, and can say that I never remember getting any emials on it except for author's newsletters and the free book links.
It's my main account that gets all the spam, not that one.
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