Kill it instead.
I intend to force them to cancel my license when I'm finished with it, so no one else can use it. They may resist - it took me a week to convince them to downgrade my "suite" license to forum-only (they couldn't understand why I wanted to do that), and I expect they will spew some line of bullsheet about how they can't cancel the forum license, but I'll be on them every day to do it until it's dead.
If you want to send them a message, make them kill your license. Make them talk about it in the halls and conference rooms of their offices. Make your feelings known. It will undermine them. It will make them wonder. "What the hell is going on? People don't cancel valid licenses..."
If you think they won't care, think again. Even a small handful of people demanding to have valid licenses canceled will make them talk and it will make them nervous. The vB team is a small part of the larger borg that is IB, and the word will get around. It may not hurt them, but it will get into people's heads and make them uneasy.
Don't go quietly.