Does this include line employees who worked at Google or Facebook or Microsoft if the company is found liable for doing something sketchy?

The sums sure are substantial. You can argue they know their employer was no angel, too. OK to claw back paychecks, or do we draw the line somewhere closer to actually participating in a criminal act?

Does that not hold true at present?

As a straightforward instance that arises periodically, if a bank were to erroneously deposit funds into your account you’re under obligation to return the funds.

I think it depends on what we mean by 'held accountable.' If it means, make best effort to return the money sure. If it means more than that, probably not. If someone robbed a bank, evaded the police and donated all that money to the Salvation Army in the next county, the Salvation Army has no way of knowing the money was stolen. So the only fair thing to expect the Salvation Army to do in this situation is, make a best effort to return what they can.