Robodebt wasn't "an investigation". It was "Our algorithm (which we know is very frequently wrong) guessed you might have money, so we've retroactively cancelle

Robodebt wasn't "an investigation". It was "Our algorithm (which we know is very frequently wrong) guessed you might have money, so we've retroactively cancelled your benefits and will come after you for fraud until you can prove your innocence via an appeal process that's been deliberately obfuscated". Governments own lawyers advised them that their plans were illegal, in advance.