While there may well be good reasons to MitM HTTPS on a corporate network, the case isn't quite so clear for secretly doing so. IIRC chrome disables altogether certificate pin violation notifications if the offending certificate is locally installed. While it probably is the right move to forgo the giant security warning in that case, I don't see why they can't use an "orange light" type indicator and in the popup explain corporate monitoring (with a further note that if you aren't on an institutional computer you probably have a virus). While corporate IT departments could recompile chromium sans message, or just ban chrome altogether, why make it easy for them?