When you install DPP having put in the serial number of your camera in the past couple of years, the software has told told you about Irista. So, those who have never heard of it have either not bought a Canon recently or haven't tried to install DPP.
If you were trying to make a cloud service fail, you'd tie it to A) an obscure registration process and B) search high and low for the least liked piece of software. Check & check.
Back in 2013, when they were likely developing the cloud system, it was all the rage to create these things because it seemed like the thing to do. The more users they had, the more expense, yet I never did hear of a mechanism by which there would be a revenue benefit to Canon. I wonder if they thought they needed it as a hardware product feature to check off, like a wifi connection app, etc. - another disastrous category of camera manufacturer software.
Hardware companies' software creations often suffer from product management that is focused on the hardware cycle, rather than thinking of software as a product in and of itself that requires investment and marketing. It's pretty typical. In sitting here thinking for a minute about a piece of software that a camera company made that was any good, I can't come up with anything other than Capture One.