No settlement should be granted here, on principle. The law should not protect those that use an asset designed to subvert the government.
With real money one could go after the money mule (or dumb scammer) through their bank account. Maybe Google could be liable if the victim paid through Google Pay, but I somewhat doubt that Google Pay will let you transfer half a million. In this case, the victim's choice of virtual currency makes it very difficult to find the criminals. I don't see why Google would need to pay up for that.
I suppose it's always worth a try to sue Google, because there's nobody else to sue.