You're question was if it was illegal. It pretty clearly is. People are prosecuted and convicted of computer crime on an increasingly frequent basis to think

You're question was if it was illegal. It pretty clearly is. People are prosecuted and convicted of computer crime on an increasingly frequent basis to think you would be able to get away with disruptive behavior like that in the long term because you think common people don't view it as real crime is naive. I also see no evidence this is true.