This isn't a very common thing, but there are documented incidents where guardians are kicked from fireteams just before a boss dies. This is usually done so that the fireteam leader can (a) bring in someone they know to share the rewards, or (b) enjoy knowing that they made someone work and denied their rewards.
A solution might be to prevent kicking when an encounter is in progress, or when a boss starts taking damage (or a combination).
Thank you 😁
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Or maybe a feature that recognise your efforts beforehand and still let you reap the reward. That's fine if it's gear, but who want to share emblems with a bunch or lame ☠️ €&/#(")€%& anyway that kicked you from the game!