Edit: It seems like they may be vaguely referencing Markus "Notch" Persson's cash flush success after selling Minecraft.
I think just being self aware enough to be worried about how "money" might change them should be enough to settle their worries.
Notch had a rough time for a while, but he was always a very public person... these guys are a lot less public and I'd suggest less susceptible to being led astray... but who knows I guess.