No, you will find quite extensive social studies done on this, weirdly with usually no echo in the press. One that had echo was that they gave 10k to a selection of people, and those had to choose wether or not to share those 10k with a random someone they didn't know. The amount shared diminished the more wealthy people are.

Other studies are done on wealthy people, and it was also found that self made men where way more generous than nepo babies. Which is coherent with the monopoly study: people with unfair advantages tends to fall deep into the fondamental attribution error.