Could you explain how they have intrinsic value? You make that claim, but you didn't elaborate on it at all.
Free (as in freedom) software is a voluntary interaction. A person or team creates software and then provides the source code voluntarily to others under the condition that they agree to use it only by certain terms laid out in a contract that is only enforceable under a capitalist system.
The value that miners get in return for mining is dependent on the value of a cryptocurrency within a capitalist society that is allowed to freely trade and exchange these cryptocurrencies. You've failed to provide a convincing argument for your claim that Bitcoin is socialist.