It is up to the parent to decide what can and can't be in your room, as they have full authority over you since they are your parents. They have the right to do so even without an explanation. Though if you need some technology in your room, such as a computer/laptop for class, you should kindly ask them to get one just for that only.
If one or the other has a condition or relies on it to much then maybe a restriction should be put in place for them. However I believe that they should have that kind of relation and not have it totally taken away. It really depends on which teenager and how they act with technology. If its a bad influence then maybe. However I think taking it away indefinitely is a bit much.
