COVID is also interestingly contagious among minks and ferrets, common lab animals used for serial passage. It's also undergone remarkably little generic drift since the pandemic began. Since the moment it was released it was already human adapted. Extremely suspicious for a brand new virus.
For SARS, MERS, etc we were able to find a 99.9% identical virus in nature. The closest one we have to COVID is 96%, quite distant genetically.
The last time we couldn't find the virus in nature was the 1976 flu pandemic. 20 years later scientists began admitting that it was triggered by a lab leak. When genetic engineering became advanced enough it was obvious that the strain was identical to a pandemic flu strain from the 50's.
In reality, the scientist new from the beginning that the 1976 pandemic was a lab leak but the information was thoroughly suppressed so that the soviet union would cooperate with monitoring. This is exactly what happened with China early in the pandemic. Nobody wanted to criticize people being welded into their homes because China was providing data on the virus. I am completely convinced that this is why the lab leak hypothesis for COVID is being "debunked"
To me there is overwhelming evidence that COVID is a lab leak from the Wuhan Institute of Virology. IMO the only reason everybody is denying it is the severe political repercussions for China essentially killing more people than WWII. US researchers are co-authors on many of the institutes papers on coronavirus genetic manipulation. The US was funding some of their research, presumably because gain of function research is banned in the states.