Many companies see Amazon as a competitor and don't want to give them money.

I use to work for a large health insurance company and much of the executive/leadership teams would openly disparage Amazon in meetings. Amazon doesn't even sell health insurance (not yet at least) and they were overly hostile due to PillPack alone.

It was one of the reasons why that company chose GCP over AWS. I imagine this scenario isn't uncommon.

It boils down to 2 factors:

- Giving money to a competitor (even if the product you're paying for isn't competition). This can be hard to justify to e.g. shareholders as being financially responsible.

- Potentially giving away trade secrets to Amazon, either in patterns of usage of AWS, or in actual data that AWS stores.

I would hope the latter is an unnecessary worry, but we've seen them clone retail products from others again and again based on best-selling or high margin products, so why not use intelligence from AWS? I assume it happens at some limited level.

Amazon treats their work staff poorly (at least on the Amazon.com side, if not AWS), and Bezos isn't a very nice human. They throw a lot of their weight around and bully small local governments into succumbing to their conquests. They are a largely unethical company, IMO, and supporting them risks further eroding small business and democratic checks and balances everywhere.