Microsoft’s service description for OneDrive for Business promises “beyond 1 TB, to unlimited” storage. In reality, most enterprise Office 365 accounts have 5 TB storage and won’t need to go further. But you can… first to 25 TB and then even more in the form of SharePoint sites. You just have to talk nicely to Microsoft support.
One of the great things about Teams is the way that it orchestrates Office 365 resources like SharePoint Online sites. The downside is that a tenant’s valuable SharePoint storage quota might be absorbed by a profusion of Teams. To offset the problem, you can apply lower limits to sites belonging to Teams and the best approach is to use PowerShell for the job.