It is not good to stereotype, rich people can be moral, but it is harder for moral people to become rich. There would be a typical bell curve for rich peoples moral, but I suspect that the mean would skew less moral than the general population. I can go search for the evidence. I believe I have read reports of studies where they found hirer instances of narcissistic neurosis and psychosis in the rich and powerful.

Here is one I found with a quick search.

https://www.psychologytoday.com/us/blog/fulfillment-any-age/201901/yes-the-rich-and-famous-really-are-narcissistic.