We define a user as one personalized email address (name@yourcompany.com). Even if this user uses multiple cloud apps (Google Drive, OneDrive, etc.) we still count it as one user.
So for example, if you have OneDrive (cloudhqtester@gmail.com), Dropbox (cloudhqtester@gmail.com), or Google Drive (cloudhqtester@gmail.com) and you sync or back up these cloud apps, that will be counted as 1 user/ license. For Egnyte, each power user used will be counted as one user.
1 user is:
OneDrive (cloudhqtester@gmail.com) ↔ Google Drive (cloudhqtester@gmail.com)
Google Drive (cloudhqtester@gmail.com) → Dropbox (cloudhqtester@gmail.com)
In other words, you can think that we are counting users in the same way as Google Workspace, Dropbox Business, Office 365 or Egnyte is counting users.