Comment by londons_explore

> If nobody else was using it, then it doesn't hurt anything.

On networks I manage, there are clients who pay for large quantities of super low priority capacity - eg. for moving scientific data around, or backing up stuff that only needs to complete sometime in the next 30 days.

That means there is no such thing as unused bandwidth - almost every link is 100% full of paying customers data, and anyone using more displaces one of those low priority customers.