Then why don't share revenues coming from micro-transactions? Engagement levels don't tell much per se, in particular with more traditional games.
They give the bundled/obfuscated version of it here:
"The increasing weighting of digital within Ubisoft's overall sales, with this segment's revenues amounting to €207.7 million for the first nine months of 2015-16 and representing 27.0% of the total, versus 21.2% for the same period of 2014-15."
Mind, Ubisoft's actual results aren't fantastic (they missed expectations) and they *are* trying to hide this, so they don't give those breakdowns, but when we look at companies like EA we do actually see that data:
Or, put another way, I don't think engagement is an invalid metric overall since it is what drives this kind of revenue, even if in this case they don't want to share shipment data for Assassin's Creed which is basically a regular ass packaged goods game with a weak digital component.
I do feel Ubisoft's movement to this type of revenue will be a boon to them in the long run since this type of content is both more profitable, more stable, and generally easier to develop than three gigantic open world games every year.