The difference is - humans now has the capability to create viruses. And it's obvious that covid is created by humans. You just need to look at its generic code to figure that out.
And then take fact that there is essentially 4 characters with million pairs to read surely some random data will collide.
Sounds to me like most realistic and simplest explanation knowing the sides involved.
It sounds more like Fauci wanted to do Gain of Function research and needed partners who wouldn't complain about small details like the law. His partners turned out to be careless enough to release the virus and here we are.