If the voice actor in question here has the option of hiring a lawyer and suing the company for wrongful use of his image. He's a professional voice actor and there is quite a bit of legal precedent^1 on his side. If they're making money off his voice/image, he has every right to sue to have all that cash transferred to his bank account, plus damages for theft of opportunity.
If they're doing it, not as quid pro quo, but instead as a marketing gimmick to sell their product, well there is legal precedent on his side as well.
If they're giving it away, though, isn't that just the same as fan fiction? Do we really want to crack down on what is essentially a fan site? Is that the precedent you want to set? It could actually drive more business to the real guy: Maybe he can strike a deal with someone to sell the rights to his voice for whatever he can get for it? Maybe this actually drives up his ability to bargain for a higher price?
Please don't let shortsighted defense of the unknown prevent you from seeing the opportunities presented.
0: https://www.dmlp.org/legal-guide/using-name-or-likeness-anot...