Well one theory states that the Chinese government covered up the evidence of a lab leak, in fact just last year it was revealed that there was three lab workers from the Wuhan Institute of Virology got sick with Coronavirus just before the outbreak (source at the bottom). And it should be no coincidence that the Wuhan food market that is the alleged location of the spread was within walking distance of the fucking biolab. Then you have Shi Zhengli - involved in a cover-up from the Chinese govt. about coronavirus - a disease not found in any animal before 2019. She lied about the US intelligence report, and in 2015 the WIV had a "gain of function" experiement where they said that the "third world war" would use biological weapons in the report, and this was just years before the outbreak. The gain of function exercise was to take a virus and modify it to become more infectious and virulent (or to better infect humans). Here's more info on the 2015 report.
https://wap.business-standard.com/article/current-affairs/chinese-scientists-discussed-weaponising-sars-coronaviruses-in-2015-report-121050900612_1.html The People's Liberation Army (PLA) scientists heralded the novel coronavirus as a "new era in genetic weapons" in said 2015 report.
Shi became known as "Bat Woman" for her work on research in bat microbiology. She is likely in on the coverup. So for now she remains the primary suspect. Because the food market theory hasn't been conclusively proven either despite mainstream scientific claims stating that the lab leak theory hasn't been conclusively proven (well no shit, the Chinese refused to cooperate with international experts from the WHO who had to conclude that it didn't come from a lab, which only drew further skepticism when the report came out).
Furthermore, China is starting to become the wealthiest nation on Earth. China is a country that invests heavily into science, technology and biomedicine. The WIV's BSL-4 lab was launched in 2017 and houses more than 1500 virus strains. It is Asia's largest virus lab. Over 19,000 bat samples had been collected in that lab over the years. Some 2 to 3000 coronavirus samples at that.
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