"Unlimited" alternatives to Google Drive, what are the options?

Just got this concerning email. Anyone else have this issue with Dropbox?

This email is an automated notification from Dropbox letting you know that your Public links have been temporarily suspended for generating excessive traffic.

No public link were created. What does this mean?

Upgrade your Dropbox account today to increase the total amount of traffic your link and file requests can generate.

I’m on Advanced so I don’t see what can be upgraded.

Your current account bandwidth limit is 4096.00 GB and your current usage is 4096.10 GB. If this is your first suspension, you may remove the suspension by clicking this link otherwise please visit the Help Center.