I've previously linked actual scientists discussing gain of function and the lab leak theory in the past.
We'll probably never know for sure, but it's at least 80% certain that the lab leak theory is wrong, and close to 100% that gain of function had nothing to do with it.
Did Fauci ever mislead? I think so. In public statements on masking very early in the pandemic. Other than that, I can't think of anything. I do recall him giving what I considered an unsatisfactory response a couple of times during the hearings, but no worse (and much more frank) than most who testify.
The right wing demonization of Fauci is one of their more evil acts.
Point being that there's no way Fauci belongs in jail, but every reason to think Trump will weaponize the DoJ to go after him and others who received pardons today. Hence the pardons.