In a less ethically bankrupt legal profession that I'm imagining, there's a thing called a Bar. The Bar has an ethics board, and they immediately take notice of

In a less ethically bankrupt legal profession that I'm imagining, there's a thing called a Bar. The Bar has an ethics board, and they immediately take notice of goings-on like this troll's tactics. They quickly strip him of his authority to practice law, because his behavior is wantonly unethical (though technically legal), and it's disastrous to the reputation of the entire legal profession. (Also, in this hypothetical world, the legal profession cares about it's reputation.)