I believe it's substantially more difficult, legally. CALEA for data-in-transit and judicial interpetations for data-at-rest mean it isn't as strictly protected

I believe it's substantially more difficult, legally. CALEA for data-in-transit and judicial interpetations for data-at-rest mean it isn't as strictly protected as personally-controlled data. So it's definitely covered by a different legal regime, to set aside the technical bits.