In the past, before the Kindle, Amazon sold eBooks in different formats including Mobipocket, MS Reader, and PDF. Amazon stopped selling eBooks and the eBooks that customers purchased were no longer available. That meant that if anyone needed to redownload to update the DRM, forget it, screwed. So no, do not trust any company (not even Amazon) to store your eBooks. Either do it yourself or take the risk of losing them.
If you buy an eBook from Amazon and the author eventually pulls that eBook from Amazon, will you still have it available?
Kobo & Google have no history of pulling eBooks from customers. But I don't trust them either to keep my eBooks. I don't trust Amazon either. I trust myself to download them and keep them backed up.
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