(I'm guessing a relatively large part is also selfish attachment to the market leader because of employment reasons. I hate wasting money, both for myself and for my employer, so I don't really understand this kind of thinking - but I do understand how it could flourish in a venture capital-rich time/locale.)
I also recommend reading:
https://thehftguy.com/2016/06/15/gce-vs-aws-in-2016-why-you-...