People are free to not use pay services that are not bound to any universal moral truth. The data collected will probably be used for big crimes, like investigating murders, organized drug running, and the occasional terrorist group's homeland activities.
I know there has been some talk about the information being used against individuals for political or finanacial reasons, but I don't see the system being proposed from such a paranoid and nihilistic perspective.
Our nation was essentially founded by rule breakers, and low end drug users probably have little to worry about in the greater scheme of things.
Although rudely put, I tend to agree with Police Detective when he states that many of us aren't that important. The government doesn't really care that you pack and smoke a bowl of high grade marijuana every night before you go to sleep.
Code words and phrases are easily created to work around texts being saved by the bigger providers and turned over to the government for storage and later data mining.