Used chains are made into all sorts of jewelery and decorative items.
If you live in an area where theft is an issue, you can loop a chain around saddle rails and a seatstay as an anti-theft item (very common on messenger bikes in NYC --- cover with used handlebar tape so it doesn't scratch or rattle).
Years ago, I tensioned dead chains floor to ceiling and used them to support shelves.
That's for starters. It only takes a bit of creativeness to come up with hundreds of uses, so think about hat you need or can use if it were free anf have at it.
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