He doesn't care about future trading.

His problem lies with the fact that a company trading on the stock exchange must make things public.
And Musk has a habit of not wanting to provide numbers, inflating them and after that claiming where innocent mistakes and so on.

Remember what happened when people asked him about the model 3?
https://www.cnbc.com/2018/08/01/tesla-ceo-elon-musk-subdued-on-q2-earnings-call.html

I love how the OP talks about the wonders of a free market and decentralization and his main goal is banning something