Human nature.
Microsoft was not populated with special people that exclusively desired more control. And Canonical is no less special.
We see this in Linux a lot. The FOSS idea is there, but developers in Canonical, Gnome, Red Hat, etc. push their desires over users wants all the time.
And we see countless Linux Tech Articles telling us what is trending, what we want... regardless of what we really want.
As users transferred from MS to Linux, they noted difficulties with Dependency issues or did not like the terminal.
Snap is an answer to that - as if to say, "If MS is what you want, then MS is what you will get." How could Canonical, known for years to take advantage of users, ignore user protest and consistently promote a brand image instead of FOSS turn down such an offer?
Migrating users from Windows to Linux should focus on teaching Users how to use the terminal and how to enjoy the control being back in their hands, not in "look how easy it is."