The TXSE was launched by an energy magnate [1] and "is financed by institutional investors including Charles Schwab, Fortress, BlackRock, and Citadel Securities" [2]. It's a direct response to the NASDAQ and NYSE putting their feet down on carbon emissions.
Nothing about its structure requires a company be incorporated in Texas much less based there [3]--those restrictions would go against the reason it was founded.
[1] https://en.wikipedia.org/wiki/Kelcy_Warren
[2] https://en.wikipedia.org/wiki/Texas_Stock_Exchange
[3] https://www.hunton.com/insights/legal/a-comparative-analysis...
As for the compliance thing it remains to be seen, but generally companies in low-compliance jurisdictions trade at a "fraud discount" to compensate investors for the likelihood of untoward shenanigans that would be prevented by that compliance.
However, post Sarbox US is vastly more regulated than the markets that "built" Silicon Valley, and there are many costs to corporations, founders and employees of that heavier regulation -- including a radically less friendly public capital market for companies worth hundreds of millions of dollars.