Q. Can goog, msft, ibm, etc... be shut down/held hostage by a rogue TA?? A. HELL NO!!!! If you dont like the TA, you fire him and get another TA, it is not that tough.
Unless you're Rufus and you think the TA is the incarnation of evil. Then you keep the TA and set a trap for them that you won't act on for years. No brainer here. Hehehe