Billionaires are human beings capable of donating to political causes out of idealism for the greater good, not necessarily only because they think it will increase their net worth by another few million dollars.
Sure, there exist conspiracy theories of mustache-twirling malevolent villains in the Kochs wanting the extra profits from deregulation or in Soros desiring to short the currency of a destabilized countries. But it is disingenuous to begin one's speculation and curiosity with the assumption that those theories of malevolence are true.