that could be an interesting vector, don't the feds have shit load of BTC from various busts? could they dump a billion into the wallet to make it impossible to launder?
I don't think atomic swaps need to be the full contents of a wallet. It means "atomic" in the usual transactional sense, not that it's all-or-nothing per address.
But even still, the idea to prevent money laundering by sending orders of magnitude more BTC than the initial scam... bold idea.