"As you probably know since you're reading this thread, often such inquiries are confidential and the recipients may be prohibited from disclosing their existence."

Yes, that is exactly the kind of thing you're supposed to be taking a stand against and resisting.

In fact, warrants like this are not "often" confidential - that is an aberration and an abomination - and a relatively recent one.

We - all of us - should publicly oppose these measures and work to resist them.

EDIT:

I think I have misunderstood - the HN title is incorrect/misleading.

Storj did not remove their warrant canary, they failed to update it.

Interesting ...