Sorry I’m late to the party. Long story short, Tor Publishing bigwigs behaved badly, even calling some of their own authors “bad to reprehensible,” while calling pretty much every SF/F fan to the right of Mao a nazi, etc.  People wrote to Tor complaining. Tor claimed it was all bots and astro-turf. So the call went out to write an email about it to three people, saying “I AM NOT a bot.”

Details here. And here. more links with more background at those two places.