It is how classes (even in person ones) are organized. Assignments, quizzes, links to online textbooks, discussion boards, student/teacher messaging, student group messaging, etc. From the teacher side, I'm not sure if there is a backup copy for things like grades outside of Canvas. It's that pervasive.

Everything from middle school up to grad school.

It's a particularly interesting time to have this happen too -- many finals going on now.