An answer at midnight, from your material and nobody else's
The tutor has read every lesson and every word spoken in every video. It answers at midnight without waking you, and it points at the exact lesson rather than improvising.
A hint instead of the answer
Checks are answered in their own words, and they get a hint rather than a mark. Free AI hands over the answer, which is precisely why it is not teaching them anything.
It knows when to fetch you
It is built to hand over to the human, not to stand in for one. That is a decision about where a machine should stop, and it is the opposite of what a general assistant does.
Privacy that is built, not promised
It cannot read another student's private work, because the search is scoped by who is asking before the question is ever seen. That is enforced in the machinery, not asked for in an instruction.