A few times a year, some industrious student has decided to Star/Hide a course that they do not wish to complete.

Moodle should allow at the Site Administrator level to turn off this feature for all course cards.

course card menu - star or remove from view

As Helen Foster noted:
In Site administration > Plugins > Blocks > Course overview you cannot select any filters, so that no course filters display on the My courses page and nothing happens if a student tries removing a course from view.