Why is this metal in the wood?

Why do you think someone hammered so much metal into this oak tree?
Holzfforma G888: http://www.farmertec.com/122cc-Holzfforma%C2%AE-Blue-Thunder-G888-Gasoline-Chain-Saw-Power-Head-Without-Guide-Bar-and-Chain-Produced-By-Farmertec-All-parts-are-Compatible-With-MS880-088-Chainsaw-p992446.html?parent_user_id=14436710&utm_source=sns_share&utm_medium=share_url
sawing equipment: https://www.farmertec.com/?parent_user_id=14436710&utm_source=sns_share&utm_medium=share_url
Very pretty, but too metallic https://youtu.be/IEWOXEyEyU0
Chainsaw Mill | Sawing old oak https://youtu.be/pP6w6njXdHk
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