I don't see why it's hard to justify. They are providing facilities for you to perform the work they request, not for your personal benefit. Invert the scenar

I don't see why it's hard to justify. They are providing facilities for you to perform the work they request, not for your personal benefit. Invert the scenario: if they told you that you had to do work-based research on your own personal Internet connection, would that be OK? Any overage charges are yours to pay, no compensation.