There zero evidence that Fauci
needed a pardon.
There a mounting pile of evidence accumulating every day, that Trump is using the DOJ to go after his political enemies, which is why Biden handed out the pardon.
Let's entertain your maga fantasy though. Let's say that Fauci is guilty of the crimes that you are accusing him of, he wouldn't have acted alone. So where's the investigation? Republicans hold both the Senate and the house, and the presidency. There's literally nothing stopping them from investigating those claims.
But not a peep from them on the subject now, why is that?