I don't know, but on the other hand, they were caught cheating, at least according to the report. Of course, the big boss has a huge ego. He's in the upper echelon, known as powerful, yet they still had the nerve to cheat on him. That’s the result of their actions, it cost them their lives, which, of course, shouldn’t have happened. But then again, they went against someone influential. Just don’t do stupid things, especially when it’s against rich and powerful people. Now, the case is progressing, but it took years. If not for the whistleblower showing up, it would’ve just stayed as it was, unsolved.
Maybe the people behind doesn't want to be taken advantage as we all know that they really take everything seriously. And if we can compare them, they are like a organized crime or a Mafia. No one is above them and so if they see people cheating them, the price they have to pay is their life.
And as you have said, they are rich and powerful and their influence encompasses government officials and corrupt police officers that is why it's hard to put them behind bars. The whistle blower should really be protected by the government so that he can tell everything he knows and hopefully the person mentioned should be put into justice by the Philippines government.