AWS is better than GCP, to my mind, because it’s more flexible, and it’s easier to get a tailored cloud solution for it. More people can help you build an entire architecture fast and cheaply.
But there are also other services that can offer you cloud storage for even less money. I am talking about websites like Fastupload.io. They are less known, but they still offer unlimited storage, fast upload, and sharing option. It might be even better than other more famous services because they are cheaper and way less complicated. I think you can use it for bots too.