The US is funding dev of SpaceX? Do you mean as a contract? Or as a subsidy?
And can you cite a source please?
Yes COTS is contract-based, but that isn't what I'm talking about.
The Air Force has dumped some $40 million into methalox engine development at SpaceX. That's just one thing that comes to my mind. And, at the state level, the company has taken subsidies in the past.
Elon has no problem taking government subsidies. He built SolarCity and Tesla with that.