How google drive defeat dropbox?

Google drive have been out this week. Google gives all of users 5gb storage freely.

In size of storage, It is useful compared with dropbox, suger sync and sky drive.

However, I think leader have a big advantage about this market. Because, user emphasize cooperation with other application rather than bigger space.

For example, "I bunko HD" is one of the most popular application in ipad. this application have a function that be able to download from dropbox. If I don't use this from Google Drive, I am NOT going to use it as main cloud storage.

Most important thing is that Google should promote collaboration of other application.