Agreed. This seems like a reasonable request to me, providing there is a warrant.
Stealing an example from mr robot, if I break into someone's computer and find evidence that proves they are trafficking underage photos, I don't see why that proof should be ignored , in any circumstances.
Sure, charge me as well with breaking into someone's computer, if you can catch me, but don't dismiss my evidence.
I think the company owning the data should be able to decide whether to give the data and aid the investigation or not (which is something that affect their reputation and that they can tell their customers, either as an advantage or a disadvantage)