Writing a law with proper disincentives is also trivial -- forget about fines. Proper jail time for senior execs and board members.
Execs and boards will be damn sure not to pay ransoms, and additionally damn sure that any company they hire to help knows in no uncertain terms that they are also not to pay any ransoms.
It really isn't that hard to write laws that disincentivize paying ransoms and aren't possible to route around with wink-and-nod bullshit.
Someone may have paid into that wallet, but who? Was it the attackers themselves, to make it seem to observers as if they succeeded? Did some consultant happen to keep a stash of crypto? Maybe the boss of the hacked organization wisely maintained a wallet for that purpose, funded by embezzling?
Loopholes exist, but in general the government is not terrible at figuring out basic schemes like this and adapt administration of the law.
As in this case, pointing out a hypothetical way a law could fail, to insinuate that all laws would fail.