I think others have already answered this sufficiently but just to make it more official. If you believe someone is exploiting please use the Right Click for: Cheating option.
The /afk system is entirely different and as noted, won’t get those players looked at.
Simply linking an armory profile of players you believe to be exploiting would be considered harassment, as it falls under “naming and shaming” or “calling out”. Neither of which we allow on these forums.
If you were having a discussion with someone in a thread and included their armory profile, much depends on the context. If you are doing so to call them out, that tends to fall under harassment.
Additional in-game screenshots should be avoided as that starts to get back into harassment.
If you believe people are exploiting, and want to report the method on which they are attempting to do so, please submit a bug report and/or write to hacks@blizzard.com.