My feeling is that money doesn't really change people, it just accentuates whatever good or bad traits they have (like alcohol). Also most Lottery winners go broke within 5 years (
https://www.cnbc.com/2017/08/25/heres-why-lottery-winners-go-broke.html).
I sold my company recently, so I experienced a similar turn of events. I'm not a very flashy person so I didn't go too crazy. I did buy a nice house in Westmount as that felt like a sound investment only to realize the sale had made the funny papers (to whoever has the sad job of combing through real estate transactions to write a gossip column...)
If anything, having money has made me less likely to take rash decisions. Ironically, my hobbying has - at least temporarily - mostly stopped: although I can pretty much afford it without restrictions, there's a lot of pressure at work (following the sale) to project a 'clean' image in a #metoo era. That tends to create (perhaps irrational) worries that so far ruin the mood for me. I suspect that will fade with time as I get used to it.
I spend more on vacations, but otherwise I mostly keep to myself.
Giving (to family and friends - or occasionally to strangers) has been emotionally rewarding, but it can also cause awkwardness. Kind of like when you're with family at Christmas and you bought gifts for everyone, but then everyone feels bad they didn't buy you a gift.
In summary, I found that being modest and quiet about the subject makes things easier for everyone.
William.