Not sure Trump has enough brain cells to fathom that he is dependent on big money. I think you expect too much from somebody with the mental age of a 5 th-former. He loves to be praised and admired - no matter by whom and he is doing everything to keep getting this kick. And sure - big money is controlling his brainless supporters through their very own media (not just Fox), which is the reason he started with a very right wing rich friendly agenda.
And sure - big money certainly loved the permanent tax cuts for the rich as well as the health cuts for the poor. But now that Trump is waging international trade wars which impact on business - this is not that good for big money. Big money is smart enough to know that bullying and blackmail does not work long term in successful business relationships. Trump doesn't know that.
But you might be right in this point - it well maybe the beginning of the end of his reign that he started to wage wars against the Koch brothers as well. But this is a tale for some other thread ;);