This is a question without a simple answer. If by "Linux", you mean the Linux kernel, then yes. The source code is available free of cost, and you are free to modify it with only a few restrictions. If you meant "a Linux distro", then maybe.
Is Linux Free?

I didn't find the right solution from the Internet.
Refrance:https://www.cnet.com/forums/discussions/is-linux-free/
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