For many years now Tesla offered other car makers to use Tesla's superchargers as long as they chip in some of the cost of building it.
It was a fair offer that no car maker took.
The Fed offers a fair deal: free money under the condition of chargers being open to all.
Tesla was always willing to open supercharging to others under fair terms so it's incorrect to label Musk as "resistant" to this. If he was "resistant", Tesla wouldn't take the deal.