Stopping this kind of thing is impossible especially when there are several high-profile and vested people involved. why things like this especially laundering through bitcoin are always the most highlighted, because this is a medium to bring in money because when money laundering is reported, it's actually quite different when there is "Crypto" or "bitcoin" in the news.
That is very right, as the media can highlight the role of bitcoin in yet another illegal activity.
But the fact is, money laundering is out of control also when it comes to fiat.
The bad thing here in this news is, these people may really had scammed people via btc.
But if they are just maybe trading for personal reasons, they may not be captured by their authorities, even if we say, crypto is banned in Bangladesh.
As for when you re-read the link that the OP put in the thread, indeed in this case there is some context about laundering through Crypto but on the other hand we also get something else not because they commit fraud through illegal and forbidden dating sites, then from other countries take dollars from this but this is not the main focus because it is certain that bitcoin is the thing that will be the main focus in this case.