Yes, it is ban-able. Is Bungie actually going to enforce it? No. They're too busy dealing with Sony and the dumpster fire that is the games never ending list of bugs.
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Bungie has never banned anyone for kicking someone from their fireteam.
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Obviously not. But it's considered a no no in the eyes of Bungie, as intentionally kicking someone at the end of a raid / dungeon encounter so they don't get loot, is considered griefing, unsportsmanlike and disruptive behavior.