One of the more problematic elements of building any application is managing end user identities. Writing the code to manage who gets to access any given application not only is time consuming; it doesn’t usually add much in the way of unique value to the application.
When Yahoo! shut off a stock quote service that developers were relying on -- albeit anonymously -- developers erupted with disappointment and anger. But those developers were probably trespassing on the service and Yahoo! had no way to notify them of the shutdown. Maybe a standard can fix that.