It doesn't really matter since it's very easy to make an ebook and distribute it everywhere. You don't need a publisher like older times ago. Maybe try ebooks for now and then sell hard copies after we get a good audience for it. 

And if BookAnon wants payment for his expansive and well presented book, he can take stablecoin crypto for payments. Have people pay what they want. Or search for a way to take anonymous payments online. Promoting the book is the only hard part of everything. 

> if Authorhouse was in options since they provide the possibility for publishing that does not require to "sell the soul to devil" contract

And that's the other thing. He needs to make sure he doesn't get scammed by the publisher he chooses to go with.