Not a big surprise, if you read the
terms of services:
Quote:
In certain cases (for example, if Google loses the relevant rights, discontinues a service or a Product is discontinued, breaches applicable terms or the law), Google may remove from your Device or cease providing you with access to certain Products that you have purchased.
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+1 for paper books. You don't have to worry about someone deleting the books that you acquired for your next vacation abroad.