We seem to be saying nasty things about them. If you want to sue them for infringement of your rights, go ahead. Maybe the ACLU will help you. None of us, not even us born ins, can say that a gun was held to our heads and we were forced to do what they said. I hate the shunning aspect of the Borg, yet they have the right to do it as much as you have the right to shun them back and post anything you want to. Your cannot force other people to talk to you. They could be shunning you because you are too tall, have crooked teeth, were jeans. People cannot and should not be forced to do things they don't want too. Free will, even for JW's comes into play.
Should they be taxed? Yes! The Borg happily uses services from the government that they don't pay for, but, so do all religions. They should all be taxed. Their tax exempt status is questionable. Not their right to free speech.