Nook and Kobo owners can blame their companies decision for their inability to read Mobi formated books on their devices.
BN and Kobo chose a different format then Amazon when they decided to go with EPub and they started selling their e-readers well after the Kindle had been released. They chose a different format, probably because they didn't want their readers buying books from Amazon, and now people who own Nooks and Kobo's complain about Amazon's not changing formats to make their life easier.
The companies that make the Nook and Kobo chose to use a different format then Amazon. Amazon did not chose to use a different format from them. Sony was not using EPub when Amazon was developing the Kindle. The format Sony was using was bad enough that Sony changed formats, so there was no good reason for Amazon to choose the same format.
Basically, this "format war" is not Amazons fault but BN and Kobos. Even with that you can read the books using any number of apps so you are not locked out. If you choose not to read the book using those free aps, that is on you and not Amazon.
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