Judging by how petty an individual Musk is alone (openly going ballistic at the slightest critique not even of his person but merely his PR stunts [1]) I assume he would never put free speech first, or only if it's people and topics that are 100% decoupled from anything he does, says, or pump and dumps at the moment. And that doesn't leave much.

[1]: https://www.theguardian.com/technology/2018/jul/15/elon-musk...