Invited to Publish a Chapter in an In-Tech Book

Open Access chapters in books with pay to publish fees seems to be a new trend. I got an invite to contribute a chapter to a book published by In-Tech. The publication fee is Euro 590. The book is available for free online but a hardcopy is mailed to each author. What I found to be even weirder is this statement:"To preserve the integrity of the review process the identity of the editor will be