Around the holiday's my wife and I usually have to go out and take some gift cards from the community and buy gifts for a family or two so their kids can have presents on Christmas. My wife always falls into the habit of bargain shopping like it is our money. Then she realizes it isn't our money and she starts to be a bit more extravagant. All that to say yes, it is easier to spend other peoples money :)
From my experience, the people who own businesses tend to live pretty frugally, until they are quite comfortably above the waterline. Even then, they are pretty careful with what they spend. It must hurt when they see their employees wasting their hard-earned money!
I think this also applies with "easy money", where it is an easy come, easy go situation. Government handouts don't generally get spent on investments, even when they could be. During the pandemic in Australia, electronics sales went up when the handouts arrived.
All of our government money went into savings or before that it went to pay down debt. I have a friend that owns his own business and while he can be frugal, I know he spent a lot of money when he was first starting out because he was easily able to write it off as business expenses.