Reuse Case: Teaching Assignments

Art students in a seminar are tasked to develop assignments for teaching in the arts. One student asks whether it was okay to (re)use assignments from other students in their own teaching. The seminar group decides it was okay and agreed subsequently on setting up an open source pool to share and support each other by not having to reinvent the wheel. Pitching this plan to another student group, the authorial status and ownership of teaching assignments is being discussed and asserted, with the rationale that individuals have put labour into developing the teaching assignments. Does anyone lose when sharing their teaching ideas, or is it a way to support others and get supported in return?