The answer
A tiny unsolicited UTXO may be harmless spam or an attempt to trace wallet ownership if later combined with your coins.
What to do next
Avoid following messages attached to transactions or automatically sweeping unknown dust. Use coin control to leave suspicious outputs unspent when possible.
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Frequently asked questions
Can someone drain a wallet just by sending dust?
No. The risk is typically unwanted linkage or social engineering, not direct key theft.