Arguably the most popular reason is "everyone else is using it". This is what I hear all the time. It usually goes like: "Why aren't we using AWS?" "Well, because it's a few times more expensive than our current infrastructure" "How can it be? If it's true, why all other companies are using it?" "They fell for the hype, just like you". Then we sit down, we do some calculations, we check different scenarios, and it always turn out AWS is more expensive than dedicated servers. In the past people also used a very strange argument that with AWS you don't need to pay the IT staff anymore - but I no longer hear this argument, I think most companies already realized how ridiculous it is. The most recent fad is the "serverless revolution" with some people claiming this time for sure the IT staff is unnecessary since the app developer can take care of everything. Good luck with that fantasy.