Based on this and other comments of yours in the thread, it feels like you have some vested interest in advertising "Netlify and Zelt" (whatever those are) without declaring your interest in them.

If you truly have no interest in them other than as a user, then it seems as if you're not aware of alternatives such as AWS Amplify. You haven't responded to any of the comments pointing out the issues with your claims.

Whatever book you're a co-author of doesn't sound as though it's worth the price.