Money changes people and I think the severity of change depends on how much money is involved.
And of course, the person in question. I have been around some extreme wealth, and there can be very big differences.
A lot of people can become millionaires overnight, and it would be great if they can invest their riches properly.
It will be interesting to see what many do. It is a bit like the transfer of wealth from the boomers to younger generations. What will a Millennial or Gen Z do with a lump of free money?