A key difference here is that Dropbox's entire product is storage. Sure, they have some corollary products now -- HelloSign, etc. -- but they're a storage compa

A key difference here is that Dropbox's entire product is storage. Sure, they have some corollary products now -- HelloSign, etc. -- but they're a storage company first. Google could kill Drive dead tomorrow and it would have effectively zero impact on their bottom line. Conversely, if Dropbox rolled out a change like Google Drive did, it would adversely affect their bottom line, and possibly cause long-term harm to the company, because it would erode trust in their core product.