First, as a parent, I must ask, "how are your grades? Are you doing your chores? Have there been any issues that brought about the sudden restrictions?"
Parents act on what they think is best for their child at that certain time. It might not be what the child thinks is best and sometimes it is Not what is best. But, they do it out of love, care, concern, any of the above. Rarely do parents do things to their children just for the sheer pleasure of being evil.