That's not entirely true. Snap is a good reason to avoid Ubuntu as you're not given the choice whether day to day apps like Firefox are a native app or snap app. You can only have snap versions. The lack of choice in having a slower less efficient version of apps forced on users without official alternatives is a good enough reason for people to recommend avoiding Ubuntu.
That is regardless of all the commercial and proprietary concerns people have.
That does not apply to Ubuntu based system like Mint where users are given choices and still benefit from other aspects of the Ubuntu ecosystem.