Dropbox is not a devs-only product, given that eg. the CEO might want a personal Dropbox folder, or one might need a shared folder between the marketing team and the developer team (and even then, at the enterprise level it is not unheard of to use simpler alternatives like SFTP/NTFS shares).

Canaries on the other hand are exclusively used by technical people, who won't mind developing and spinning up a tiny honeypot.