We will allocate Clients an unlimited amount of bandwidth. If a Client causes continuous server or service interruptions under their current plan, then they will be asked to upgrade to a more powerful plan.
It is HIGHLY unlikely that any site would do this on its own. If it did, it should not be on a shared hosting service to begin with.
If they are using over 10Gbits of bandwidth, they are either DDoSing, or being DDosed.