Lab leak is HUGE for corporate interests. It's China. If China has culpability in using dangerous things and let this loose then China is going to be blamed, in large part, by a large number of people around the world. Since China is basically the lynch pin of all commerce in the world [1], there are massive interests to make sure it's "from china" but not maliciously or because of some future war they are planning. If it truly was from a market or just a bat in a cave - no one is really going to blame China beyond just minor shaming on them having wet markets.

1 https://www.youtube.com/watch?v=u000_n3LG9U