[dacm]

Forcing you to give consent to receive a newsletter in order to download the ebook is not the way to go

[luhego]

Nobody is forcing you. You don't have to fill the form if you don't want. Exchanging the book for your email seems a fair deal to me.

[wbxrs]

Do you expect them to get nothing in return?

[scbrg]

That's the traditional definition of "free" (as in beer).