[tcptraceroute]

The title here isn't quite accurate.

Dropbox has moved user data from S3 to its own colocated data centers over the past few years, and is also doing compute in those data centers too. The compute actually existed for quite a long time - in the past you'd be talking to a Dropbox run server which would connect back to S3 to retrieve data.

Dropbox is definitely still an AWS customer, just not a major S3 or EC2 customer anymore. For example, all transactional email uses SES, and DNS is hosted on Route 53.