If the question is sufficiently related to the actual application, it could be an interview of the "solve our biggest problems for us, unpaid, without context"

If the question is sufficiently related to the actual application, it could be an interview of the "solve our biggest problems for us, unpaid, without context" form, which I experienced once at a tiny startup. The technical lead just sat there silently as I probed with more questions. Eventually, I set down a boundary and let them know that that is something for the business to solve.