Perception that they are THE cloud player to use with great reliability and enterprise focus, so people support their protocols and develop their products for AWS and end up with a bit of lock-in. Mid to large enterprise continue to get on the cloud train hype and spend tens, to hundreds of thousands a month on AWS/S3 instance costs and cannot figure out how or why the bill is so expensive. Then they spend internal costs and personal resource time trying to figure out how they spent so much money on AWS. This happens where I work on both the test/dev and also production hosting.

If DO or Linode were an option to consider, we might be able to save so much money but our own customers use and believe in AWS so we develop and test on AWS. It's a bit of a vicious cycle.