Life is a open book exam. You are free to take any idea from anywhere, spin it around and make use of it.
And really what's the point of getting grade/scores in school, when we can teach kids to collaborate with each other and create great new things.
Not everyone will be good at math, not everyone will have same drive to study physics. But everyone of us might find smth interesting in a project.
We shouldn't be pitting students against each other.