The entire point of the prosecutions of Trump, Powell, and others is not to enforce the law but to prevent Trump from getting elected again and to damage the defendants personally and impose costs on them as Trump supporters. For Jack Smith and the other prosecutors involved, they know that even if Trump and the defendants are fully vindicated in the long run, there is unlikely to be any cost to the prosecutors themselves personally due to prosecutorial immunity.
For the most part, the worst that could happen in the way of payback is that the taxpayers of Georgia and other jurisdictions may have to pay for the legal fees, lost income, and reputational damage done to the defendants. Or, if Trump gets back in and put an aggressive Attorney General and line prosecutors in place, there is a thin chance that a criminal conspiracy to violate the civil rights of Powell and other defendants might be proven against Jack Smith, Fani Willis, and other deranged prosecutors.
Could be, but Powell is in a little different situation, she is a lawyer and took an oath to not represent falsehoods to the court.
If they can prove she knowingly did that, at the very least, she will lose her law license and ruin her career, same goes for Guiliani and the other lawyers on the case that were indicted.
In fact, even without the indictments, all the attorneys are likely to have licenses pulled.
She being convicted for disagreeing with The Government.