A combination of name recognition, customer satisfaction or customer inertia, a decent product, and data compartmentalization. For example, it irks me that Goo

A combination of name recognition, customer satisfaction or customer inertia, a decent product, and data compartmentalization. For example, it irks me that Google Drive is a catch-all storage space for Google products; sometimes all you want is a dumb folder that just syncs up and down whatever you put into it and Dropbox (and Box) give that to you without any mandatory integrations that benefit the companies that bankroll the storage (Google Drive, OneDrive), but not necessarily you. It's also nice that Dropbox treats every platform as a first-class citizen. It's pretty obvious that some storage products are a just pieces of a larger puzzle that you happen to be able to use as a cloud drive, while some other companies make it clear that offering a cloud drive is their primary business.