"Hey, you see this part of the code where you sort through the parents, to separate them from their children? Maybe don't do that?"
ICE is going to ignore any unprofessional suggestions, that's not what they hired GitHub to do.
In fact the usual argument employers give when you don't do exactly they hired you to do - "that's not what we hired you for" - is pretty strong. And unless GitHub sabotages their own work (which they won't), then their work will simply be in service to ICE's goals. There's no room left over for contributing non-work opinions.