I'm not sure I understand why people are so intimidated by Google. So what if they enter the same niche someone else is in. The way I see it, Dropbox has been around for years and thus having a lof of experience when it comes to usability and users' needs. Google needs to catch up - though I doubt they'll ever really be on par with Dropbox (apart from disk space) - Google has never been known for good user experience (minus the search functionality, which is good)