Do they still use AWS for compute, with their own data center just for storage? Or do they have their own infrastructure for compute?

If I remember correctly, they noticed they could dust costs significantly in storage compared to S3 because the vast majority of files in your Dropbox folder just sit there and hardly need to be read or written again (photos, etc.).

If they’re not using AWS for compute, it’d be interesting to see what sort of similar reasoning they have for why the costs are cheaper in house.