That the person might use a program

Who decides if they are using a program?

The red ! means that person is a FoD moderator.  Now since you're going to ask.. a moderator has the ability to issue punishments, demerits and/or ban you from the site for breaking the rules.

http://www.flyordie.com/games/help/moderation.html

-RTD
FlyorDie Moderator

NO RALPH, HE SAYS the red exclamation mark NEXT to a persons, IT MEANS HE USE PROGRAM.