There is no evidence that the virus came from the wet-market. It was just an easy first assumption. A crowded market is likely to have many cases of a very infectous virus. Not because it started there. But because many people would have contacts to the market and once in the market, it would multiply ferociously. Each new case leading back to the crowded market. So, many cases in the market is expected no matter where the virus originated from.
Something that points against the market were the citizen journalists who swarmed the market in early January looking for the source. They could not find a source at the market. The market did not sell bats and had few live animals. The folks that sold animals did not report any illness. And the wet-market was relatively clean compared to traditional wet-markets. Wuhan is a modern city and the market had many modern amenities, fresh water, electricity and an upscale clientele. There was nothing third world about this market.
But the virus lab had lots of evidence it was involved in the origins of the virus. Workers and friends of the lab were among the first victims. The lab was ordered to shut down. And all its information was ordered destroyed. So its clear the Chinese authorities thought the lab was the culprit. Additionally, lab workers disappeared without a trace. And then we finally get to the fact that the lab was working on the very type of virus’ isolated in the epidemic. And the lab started to isolated the virus in December well before the virus was deemed transmissible from human to human by the government.
Patient Zero was Huang Yanling, graduate intern, Wuhan Institute of Virology. Worked directly for Shi Zhengli, her post infection nurse was Patient 1, who went shopping for Huang at the market.
Virus escaped thru stupidity, the coverup was intentional.
Occam’s Razor.
Natural cross-species transmission of a virus requires proximity of both animals and humans. All past pandemics originated in rural areas, where nature is. The Wuhan pandemic virus is the first in history to make the jump in a nature-free developed environment. It's near certain the Wuhan virus release was man-made in an act against nature.