They just need to blacklist it and not let it login. Linux doesn't need the bad stigma when multiple versions of every app is already a problem with Linux. Steam is in just about every single repository at this point. No need for "another" snap package.
Ubuntu and Snap have become the black sheep of the Linux world. Very interesting considering Ubuntu was THE go-to distro for newcomers not that long ago, but now many recommend people avoid it like the plague.
In the future, Valve may display a warning when using the unofficial Snap version of Steam on Ubuntu Linux. A flood of bug reports to Valve may make this move necessary.