actually who decide that who get to keep the money? originally the money comes from scam victims of all over the countries right? Not just from Singapore, why the Singapore government get to keep the assets?

Just a question.
The money are criminal proceeds of money laundering into Singapore.
The criminals are caught and jailed in Singapore for money laundering into Singapore.
As part of the penalties of our laws on money laundering into Singapore, we forfeit the criminal proceeds of money laundering into Singapore.
We did not charge them for scams because they didn't commit scams in Singapore.
We did not jail them or fine them or forfeit their assets for scams.
We don't have jurisdiction anyway.
They laundered money into Singapore.
And the money are criminal proceeds of money laundering into Singapore.