The original form of the Presidential Surveillance Program didn't compel service providers to share this metadata. The providers willingly shared it. There is a

The original form of the Presidential Surveillance Program didn't compel service providers to share this metadata. The providers willingly shared it. There is a reference to a service provider backing out of the agreement several years after it started stating they would feel more comfortable continuing to share their data if the government compelled them. This may have changed since 2013.