1. They do it for the money
2. They will be and want to be a central bank
And they could want both! Why do we need Central-banks in Crypto? This will turn out as a Scam or as a centralized project (or both) with all the power in the hands of just a few people. And everybody who invests in it needs to trust them. And sorry, but I don't believe in "non-profit-organisations"... it sounds like a joke and I would feel like an idiot if I would believe that and give them some of my money. ;-)
Plus: If it should be true, that they just have honest plans, they would have to prove it over time.... over years. But there will always be doubts, because nobody will ever know it. At the same time there are some really great projects out there without this extreme wealth- and power-centralization. The downfall is already implemented. I will watch it like I watch/ed Paycoin.