Report them.
With enough reports Bungie investigates that player but it takes more than one or two reports to flag them.
There have been already 2 people I have seen complaining on the #Help forum due to being banned for using bots to avoid the afk system in gambit and the crucible.
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The problem currently is that the situation points to Bungie not doing anything. The picture I linked, almost 1000 games of Gambit botted, along with a premade bot. 90% of crucible or gambit matches contain one bot or more. If Bungie is coming down on those who bot, we wouldn't be in this position
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Tell that to those who have been banned those who have complained on the #Help forum and those who know what they did was wrong and stayed mute.