Do you have permission from the reddit users to include their content in your book?
The question is whether you have obtained permission from each individual whose original work you have copied.
Is this a joke and you did not actually mention these people (not that it changes anything copyright wise)?
Or are you telling us how smart you are when doing illegal things?
I really do hope a DCMA brings your website down, you may then understand that when you are kindly told that you are stealing things, it is worthwhile to listen and not answer bullshit.