FWIW there was a special investigation into the US spying in Germany but it didn't lead anywhere because there was no political desire to create any consequence

FWIW there was a special investigation into the US spying in Germany but it didn't lead anywhere because there was no political desire to create any consequences. It seems to boil down to everyone in government who was affected already having been aware that the US is likely spying on them and shrugging it off as a cost of doing business with the US. Additionally the US used to have a legal provision in West Germany that provided them a carte blanche for various covert ops shenanigans due to the outcome of World War 2. Officially this contract ended eventually but everyone aware of that history seems to be certain that it was merely replaced by similar but less publicly visible agreements.