Blizzard has admitted that right-click player reports can automatically mute people for dozens of posts over the years. They even announced the automatic mute in this post when they introduced it in May of 2007:
https://web.archive.org/web/20070528080211/http://www.wow-europe.com/en/info/faq/squelch.html
Man, you really got 'em with this! People need to stop conflating automatic chat mutes with automatic BANS, which do not exist from right-click player reports. Bans and chat mutes aren’t comparable. Chat mutes don’t stop bots from playing the game, bans do. If we could ban bots with our reports, we’d have self-policing communities. Look at the fervor that players are reporting people in AV with, or this event. Are you claiming that players just don’t report the bots, cause what, they like to complain about them ten thousand times on the forums but are too lazy to report them? What’s your excuse here?