First they killed the ebooks they did before mobi/kindle.
Then they turned off the Mobipocket servers for DRM, for pre-Kindle DRM.
They bought Mobipocket in 2005 (Mobipocket had sold ebooks for Symbian, Windows CE, Palm OS original, windows etc) either because they thought Adobe was going to cease doing eBook stuff, or because the first Sony eink was released, or because they didn't like competition. Amazon was very successful before then with paper books, but not on ebooks. They started the eReader HW project in 2004. Maybe it wasn't going well?
Amazon told publishers in 2011 they would end the support for Mobipocket DRM. They shut down the DRM servers in 2016; they had launched the Kindle (partly based on Linux and partly on Mobipocket SW) in 2007. The original azw was mobi format with Amazon DRM instead of Mobipocket's original DRM and launched in 2007 for the Kindle. As far as I can make out, Amazon never used actual Mobipocket DRM on the first Kindle, it only read DRM free mobi or prc. DRM was only via azw (Amazon DRM version of mobi ).
Other issues that are not to do with ending formats:
https://en.wikipedia.org/wiki/Amazon_Kindle#Criticism
Quote:
In June 2022, Amazon announced that it will shutdown its Kindle bookstore in China and starting July 2023 Kindle users can no longer purchase online books in the country. However, existing customers could still download previously bought titles until June 2024.[202]
Also in June 2022, self-published authors protested against Amazon's e-book return policy; whenever an e-book return is made, royalties originally paid to the author at the time of purchase are deducted from their earnings balance, leaving authors with negative balances.[203]
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Microsoft has killed off at least:
A smart watch system that used data via FM Radio.
DRM music system "Plays for Sure"
Some Wordprocessor formats they had can't be read by current MS Word (maybe Word for DOS, pre Win95 Word, and MS Works).
MS lit ebooks
Their own Web browser Engine. They now use Google's Browser engine in Edge.
Epub reader in their Browser.
Ability to run DOS in Windows (only ever worked on 16bit & 32 bit Windows).
Ability to run 16 bit Windows on NT.
Many older 32 bit windows programs on 64 bit Windows.