As I've said many times, I do not believe the virus was manmade or accidentally released and I doubt it's worth rehashing why other than to say that most virologists still believe that SARS-CoV-2 evolved naturally, like every other virus in the history of viruses. But the Chinese have contributed to the conspiracy theories on them being responsible in some way, by not being transparent. My belief is they weren't transparent because they didn't want anyone knowing how harsh their lockdowns were and how many people were likely killed in Wuhan (10-20K or more, not the 3000 "official" deaths) or how early the first cases were.
For the latter failure, that would place major blame on them for not giving the world much more of a heads up and while I doubt there's any way the pandemic could've been contained in China (it's just too transmissible), knowing a month earlier could've resulted in getting vaccines a month earlier, perhaps at least saving a few hundred thousand lives, worldwide. Hopefully the WHO team can actually find an intermediate host or a closer "relative" on the evolutionary chain in bats, but no matter what, because of that lack of transparency, some % will always believe that China was responsible.