I don't understand how this was wrong. If there were 100 people tweeting about my startup, and I manually went and tweeted a "thanks for checking us out!" to e

I don't understand how this was wrong. If there were 100 people tweeting about my startup, and I manually went and tweeted a "thanks for checking us out!" to each of them...I'd have my account suspended? From the title I assumed he was using a robot to send auto replies to anyone who tweeted about new search engines, but he was doing this by hand? How is this bad?