Every other theory requires involving many more unsupported hypotheses.
This would be obvious to the majority of the HN population in most cases, but the disinformation in this case is apparently quite effective.
It doesn't make much sense to single it out here, the most plausible version of the lab leak hypothesis is that covid is the result of cooperative research undertaken by American and Chinese scientists and funded by both governments
Edit: I'd love to receive a substantive counterargument from the downvoters