Just avoid Amazon
Their mission is very simple. It is to drive every other retailer out of business.
They have a monopoly on book selling and almost one on publishing.
People rant on about the 30% that Apple (and others take for their app store). Want to self publish that novel you have been writing for years?
Amazon will take 30% but would much prefer to take 65% of the revenue and their exchange rates suck big time so watch out if you sell abroad. You might end up with 20% of the selling price as revenue.
If you think that Google is Evil then Amazon is in a different league of evil. They are IMHO the devil incarnate.