Because the Trump administration decided that along with a bunch of other offshore collaboration funding decided to pull the money (America First!). There's a Vincent Racaniello episode on Microbe TV that explained what happened there. I don't remember the episode but here's his channel:
https://www.youtube.com/c/VincentRacaniello/videos
I think if folks would listen more to virologists than the press they'd find out that it's incredibly difficult to engineer new viruses (that's actually in his coursework - also on his channel), but it's also incredibly difficult to create stable "gain of function" (for weaponising) which has been suggested as the source of SARS2 and that whole Wuhan conspiracy theory thing.
Are virologists the only humans who, thwarted by one jurisdiction's limits, give up without considering doing their career-making, essential-to-humanity work elsewhere?
> …it's incredibly difficult to engineer new viruses… [and] …also incredibly difficult to create stable "gain of function"…
Indeed, but humans do incredibly difficult things all the time. In fact, they're often attracted to the challenge, and seek funding to help them do it, and often don't let a 'no' from any one funder stop them from bootstrapping work in other ways.
It's also incredibly difficult to engineer & get approval for vaccines to a brand-new disease, but that got done, recently, faster than ever before.
It was incredibly difficult to create nuclear weapons, but a lot of countries have done it independently.
Given the significant number of dangerous pathogen escapes from disease labs, it's also "incredibly difficult" to keep dangerous contagions safely contained. It's comparatively easy to accidently let them out!
My point is it would have required a virtual miracle for the proposed gain of function research to have produced something that could have escaped in the time framed that is possible regarding the rejected grant request. Additionally, good research has proven that Covid couldn't have been due to gain of function research either.
And why would it take a "virtual miracle" to accomplish via purposeful lab work the same thing that a 'wholly natural origin' explanation would suggest happened by dumb luck in natural recombinations?
What if it was both 'natural origin' and a 'lab leak'? For example, perhaps a wholly natural zoonotic event created the novelty, but it wasn't circulating in humans until after researchers found that crossover-ready virus in the wild – doing research similar to that in this just-revealed proposal – & brought it to Wuhan for study. Then, either with or without further 'gain-of-function' tinkering, inadvertently let it loose into an urban population?