It turns out CZ is such a speculator.

Xu Mingxing accused CZ of fabricating his technical background during the interview, claiming to be an internet technology expert skilled in building trading systems, which helped him secure a high-paying CTO position.
When database performance issues arose, CZ, as CTO, could only stand by helplessly and was unable to address the problems.
He was assigned to build the FIX API, but after a month, there was no progress, and it was ultimately completed by other engineers in a few days.
When the matching engine encountered errors, CZ was unable to fix them and had to rely on other engineers to design a new version; during this period, CZ publicly claimed to have led the development of the matching engine.
During his tenure, he contributed not a single line of code and did not resolve any technical issues.