Minor snark aside, Musk's companies have not availed of any government money that wasn't available to others. And in many cases Musk's companies weren't even the beneficiaries of said government money, quite often that money went to the purchasers of products made by Musk's companies (Tesla, electric car subsidies go to car owners, not manufacturers; Solar City, feed in payments go to the owners of the solar equipment (and yes I realise sometimes that is to finance companies and/or to Solar City)). In other cases like SpaceX they have competed for government contracts and won those contracts.
But at the end of the day Musk's companies typically attract less subsidies (Tesla / Solar vs other car companies / oil / gas / coal companies) or charge the government less for the same work than others (think ULA). So in effect they are better for the government's stated goals than a lot of other companies. And yet at the end of the day Musk's companies need money to survive and grow just like any other company; government or otherwise, and compared to many other companies in their respective arenas their revenue from government contracts can be substantially smaller pro rata.
So in the end Musk's companies will use whatever influence they can (this is called hustle in start ups), and they need money (and do whatever they can to avoid being solely dependent on government cash). And to top it off they actively support competition, even when they could afford to stand still and reduce the rate of innovation.