Because until this thing gets diffused and dissected by everyone and their mothers, the law is likely to view it as publication of confidential trade secrets, and people who can be confirmed to be spreading such things can get federal time, e.g. [1] for example. Using a VPN is the barest of mechanisms to try to obscure your identity to avoid this sort of punishment.
[1] https://www.wsj.com/articles/SB10001424052970204409004577158...