Amazon has a huge fake ebook problem as well.
I recently spent $2 buying an ebook that is still copyrighted. It is cheaper than the first item in search result that has more reviews. I thought, it's an ebook, what could go wrong.
Upon opening it, I found that the formatting is completely off. Words are concatenated. It was impossible to read.
A few days later, I noticed that the book is gone from Amazon store. I cannot open the link from my order page, and I cannot even ask for a refund. I had to ask customer service to do that. I guess this was a pirated book that was taken down.
It was a shame Amazon did not even notify me of this.
And I hope this doesn't happen on kobo or elsewhere.