The Windows API is so broad, so deep, and so functional that most ISVs would be crazy not to use it. And it is so deeply embedded in the source code of many Windows apps that there is a huge switching cost to using a different operating system instead...

It is this switching cost that has given the customers the patience to stick with Windows through all our mistakes, our buggy drivers, our high TCO, our lack of a sexy vision at times, and many other difficulties [...] Customers constantly evaluate other desktop platforms, [but] it would be so much work to move over that they hope we just improve Windows rather than force them to move.

In short, without this exclusive franchise called the Windows API, we would have been dead a long time ago.

--Internal Microsoft memo drafted for Bill Gates, Feb 21, 1997

In 2002, Be Inc. sued [4] Microsoft claiming that Hitachi had been dissuaded from selling PCs loaded with BeOS, and that Compaq had been pressured to not market an Internet appliance in partnership with Be. BeOS also claimed that Microsoft acted to artificially depress Be Inc's IPO. The case was eventually settled out of court[5] with no admission of liability on Microsoft's part.

--Wikipedia page about BeOS

I frequently think of the behaviors I see in terms of human behavior and human emotional responses even though I know that they are wrong. The motivation and perception of a pig is incredibly different from that of a human, even a child at a similar level of intellectual development. The perfect person to readup on to learn about how fundamentally damaging the "anthropomorphic" view is to our understanding of animals is Temple Grandin.

Science has shown that animals such as mammals and birds feel pain in a manner similar to humans. Insects, viruses and microbes are not able to feel pain or suffer. More research is needed to determine the extent that fishes and amphibians feel pain. Present research shows that they do experience fear. Fear is very aversive and animals should be shielded form situations that cause great fear. Fear will cause a great rise in stress hormones.
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When the structure of the brain and nervous system is studied, there is no black and white line between people and higher mammals such as chimps, dogs or cows.
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As nervous system and brain complexity increases the welfare needs of the animal increase and become more complex, but all animals that have sufficient nervous systems complexity to suffer from either pain or fear need basic welfare protections. Animals with complex brains also have greater social needs and a need for greater environmental enrichment.
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It is obvious to me that intelligent animals such as elephants experience emotions that are more complex than simple pain or fear. They will need different legal protections than animals with simpler nervous systems. The degree of protection, and environmental and social enrichment an animal will require will be dependent on the level of complexity of its nervous system.