Kind a propos, just recd e-mail from them that says:

Dear valued user of Microsoft Tag:

We have updated our terms of use under the Microsoft Tag Service and Tag Creation API Agreement. These changes are effective immediately and do not require any additional action from you. You may review the new terms of use here: http://tag.microsoft.com/tag-terms-of-use.aspx. Users of the Microsoft Tag API will not need to reapply for a new API key due to these updates.

Among the changes, we promise to you that certain basic features of the Microsoft Tag service will remain free for as long as we operate the Microsoft Tag service. These basic features are defined in the terms of use, and include the ability to create basic Tags. We will also use commercially reasonable efforts to make these basic features available until at least January 1, 2015, and provide two years prior notice before we terminate the basic features or the entire Microsoft Tag service. Please review the new terms of use to see the important details of these changes.

Thank you for using Microsoft Tag.

The Microsoft Tag team

P.S. I'm a "user" in that I have Tag on my BB Torch (along with ScanLife, QR Code Scanner Pro, Barcode Assistant, and BeeTagg)