Did you care about it all of the other times it happens? Did you care about it in all of the other industries? Spare me the false morality.
I've said in the past, in this forum, that the revolving door between government and the private sector is rife for corruption. Nor am I the only one who has said so in the past. But it's not illegal and it's not corrupt nor is it a conflict of interest just because it exists so long as the politician is out of office at the time.
But if someone never cared about this before Biden then I don't buy anyone's moralizing at this stage. If people only think things are immoral when the politicians they love or hate are involved then they're not advocating principles they actually care about.
To put it in the current context -- Trump and his family were involved in larger business transactions far more openly while actually in office. If that didn't bother someone, this Biden stuff shouldn't bother them either. If it did bother them, they should have receipts where they've said as much.