Instead of enumerating what they don't do, which leads one to wonder what's left out, they could exhaustively enumerate the ways that they do cooperate. To a certain extent that's what they do with the transparency report. But I saw no strong claim that the report was complete, on the contrary the "whenever possible" language outright suggests the report is incomplete.

I'm sympathetic to being caught between a rock and a hard place, but given that this program only seems to involve US based companies, I would suggest that where ever possible people should prefer non-US software and services. Just as one prefers non-Chinese hardware for the exact same reason.