Canonical is a company (which means "for-profit") that offers you a free operating system by integrating the last changes and making it easy for people to use. It's also quite small company compared to Apple, Microsoft or even RedHat.
You have written a rant because when you login to the session you have 3 textual lines of ads about k8s? Does this bothers you so much to this point? Your personal information is never sent to third parties and the ad itself is not flashy with popups so what hurts you exactly in this case? You can even clean it in a second.
I thought they made an ad appear periodically after writing a couple of commands...

Companies in our system needs to get cash instead they die. So better focus the critics on the big ones that already are hurting people and managing to never get any opposition at all.

P.S.: I don't work with Canonical but I use it as my OS for more than 10 years now, and during these years I've always seen civil wars in the FLOSS community and from the outside on this same community.