Hygiene was obviously selected by Andy and many others because it is easy to understand from its common usage, and who can possibly be against hygiene. Wash your hands before eating. Brush your teeth. Take a bath or shower. Change into clean clothes. Oh yes, we need cyber hygiene.
The easiest way to see the misuse and flaws in this term is that periodic wellness exams and vaccinations are not hygiene. Not everything a person does, and little a person has done for them, to maintain health is considered hygiene.
If we must keep the term cyber hygiene, then cyber hygiene should only include: