I got an email sort like that today, but my account is still working. Im not paying for it either, just try and not use it until next month and it will reset itself.
Here is what they sent me.
Every free account with Photobucket is allotted 10 GB of monthly
bandwidth and our records show that you have less than 3 GB of
bandwidth left to your account.
We recommend that you upgrade to a Pro account at this time.
Click here to keep your images and video clips active!
With a Photobucket Pro account you get unmetered monthly bandwidth, 10 GB
of storage, removal of advertisements for this account, and premium
support. Pro accounts are only $24.95 for a full year -- just a drop in
the bucket!
Upgrading isn't mandatory, but if you exceed the free allotted bandwidth
remaining for your account, your files will be temporarily disabled and
replaced with a "Photobucket Bandwidth Exceeded" icon for the remainder
of the month's cycle.
Your bandwidth usage will reset to zero on the 08th of next
month's cycle based on your original registration date. All your image and
video files will be reactivated at that time.
For more information, please visit the Photobucket FAQ at
http://photobucket.com/faq
Thanks!
Photobucket