Why ask why?:
Teacher A makes quiz, shares the link with other teaching staff/students...then retires or leaves (their account gets disabled first).
Are the forms still retrievable? What happens to them?
Are there plans to "attach" the forms to a "Classroom" (the 365 group that is created in the MS Classroom App)..so that way any teacher of that class (teachers move to other schools, but the class remains at the originating school) can reuse/edit the original form?