It is important for context to understand that this should only apply to unlimited data plans. Conceptually it is because there is limited spectrum available to consumers overall which limits bandwidth. Financially, they should not do this to anyone who is paying per gigabyte for their data plan. It’s your data that you paid for. That has not stopped them from trying. If it is unlimited, it simply stops abusers from running an entire household off of spectrum that everyone has to share.
As per usual, the truth is lost in the nuance.
Under my current plan I get unlimited data and 10GB free tethering.