You don't see the conflict of interest in one person both controlling how public funds are spent, and running private companies that may have those funds directed to benefit them?

When Elon runs his companies, he is beholden to shareholders to use the company's resources effectively to generate and maintain value.

Who is Elon beholden to when managing public funding and programs as an unelected non-official? Who will vote him out when he wasn't voted in? Who will revoke his confirmation when he was never confirmed?