> The institute has been an active premier research center for the study of coronaviruses.[6]
> In 2015, an international team including two scientists from the institute published successful research on whether a bat coronavirus could be made to infect a human cell line (HeLa). The team engineered a hybrid virus, combining a bat coronavirus with a SARS virus that had been adapted to grow in mice and mimic human disease. The hybrid virus was able to infect human cells.[17][21]
The evidence is pretty damning, and points to way too much to be coincidental. It's not solid evidence, but that would be impossible to get since China blocked anyone from visiting or doing independent investigations.
My major and Msc are related to microbiology (which is highly related to virology), and I'd estimate it's a 95% chance of having originated from the lab.