the White House has, for the past decade, provided more than $6 million to the program, which allows the targeting of the records of any calls that use AT&T’s infrastructure
the program takes advantage of numerous “loopholes” in federal privacy law
the DAS program has been used to produce location information on criminal suspects and their known associates, a practice deemed unconstitutional without a warrant
(This website is a bit annoying.)
Hence the “may already…” depending on use case obviously. You can’t really recommend anything to someone who may be at risk, certainly not Signal. Not that I have anything against Signal (I use it daily and have been for years) but anonymous it isn’t, not in big part of the world anyway.