Is the Dropbox plan to be a better-than-the-default sync provider, something you purchase in addition to the Google Cloud or Office 365 subscription? I've been

Is the Dropbox plan to be a better-than-the-default sync provider, something you purchase in addition to the Google Cloud or Office 365 subscription? I've been thinking that it will be hard for Dropbox to grow alone, but I would have expected them to establish closer ties with companies offering complementary services. I see Google Cloud as a quite straight competitor for Dropbox. Teaching Dropbox customers to use services like Google Docs might be risky.