You already owning a device, and that being your node is bitcoin having a cost?
I already had a laptop too so I guess that was just free as well.
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your laptop wasn't free, but did you purchase the laptop for it to be a node? I assume not, you need devices in our world to work and to live. And those can also be a node. In that case, it's free to run a node and use bitcoin. There is no new added cost for you to run a node.
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