He does also own holiday homes and farms but for the most part he doesn't go in for the typical billionaire lifestyle. On the surface it seems less awful than Musk or Zuckerberg but to hoard that kind of wealth while people suffer is unethical. He may have pledged to give away his wealth, but now he's giving it to his children to give away. What's stopped him from giving it away for the last 30 years?
He famously drives himself to work every day in a battered old car because he doesn't see the point in spending money where he can avoid it, so I'm sure he's timed it.
Not to be that guy but if your community gets cut off from the Internet in an economic collapse maybe audiobooks of public domain works are not super important