In that side, there are trusted NGO's where you can partner if you are really aiming to help, like you said they manage to established thier good reputations and long lasting services to keep their partners and let them assist with good deeds that they wanted to provide, though same with what the pot above you there are NGO's which created to hide the true intentions and we can't deny the fact that they can be use as platform to launder money.
Some of those can be related to those who operates underground gambling they can hide and show some charity deeds but the main intention is to keep earning money out from the sight of the authorities.
Trustworthiness can be lost along the way. I don't question the work of some NGOs, but we're all in the same boat, and it's easy to fall into error, accepting shady transactions to the detriment of users.
Where money flows, corruption almost always comes into play. In gambling, where flows are very high, shady individuals find their way in.