No it's been trivial to make cracked unsigned binaries via disassembly for a long time. Only a 1 bit change is often needed to disable something important. It's

No it's been trivial to make cracked unsigned binaries via disassembly for a long time. Only a 1 bit change is often needed to disable something important. It's unclear that anyone making malicious binaries with their keys will bother to setup a proper compilation environment. With similar systems that intentionally support open source one can just switch to trusting some hobbyists keys instead of the compromised vendor. There's very little incentive for vendors to set that up correctly though.