I've wondered how much of the cloud spend in the world is just junk like this.
I don't mean that cynically or sarcastically. The cloud makes it legitimately more easy to deploy resources; I've experienced this in my own teams. But the flip side is that it is easier to deploy things without thinking about the costs, or deploy things and forget about them, and management can just shrug and say "yes, it's cloud, it must be cheaper and better".
This is by no means a cloud-unique problem. Watch any datacenter a company has been at for a few years get shut down and moved to the cloud. The stream of "hey, who owns this?" and "are we still using this?" and "I just yanked the network cable, has anyone noticed?" is morbidly amusing. Even if you think you're tracking everything, you quite likely aren't, because the owners don't update their own tracking info very well.
But cloud makes this worse.
So I just find myself wondering how much of AWS profit is on this sort of stuff.
I myself have S3 buckets full of crap. As I do watch my spend, said buckets full of crap are in the ~10-50$/month range. At that price point it is difficult to justify engineering time to clean out the crap. But it's not hard to imagine that scaling up by three or more factors of magnitude.