"financially sustainable" - Guardian Media Group so what is "sustainable" about?

Writing to staff, Miller said that the results "underlines the need for GNM [Guardian News & Media, the immediate parent of the Guardian and Observer] to transform itself into a financially sustainable, digital-first organisation," a need that he went on to to describe was "pressing".


The word "sustainable" is widely used but I am still not sure what it means. Here is an example from the Guardian. what to think?

Perhaps there is an implication of stability. as if a sustainable organisation stays much the same.

But "digital first" at the same time?  Could be rapid change as well.