That's only partially true, and not really an option for most. Your trivial expenses are related to the amount of money you have. For most, a $3 coffee or $14 cocktail go from trivial to significant very quickly.

If you have 10x that amount of money, then your trivial expenses are also 10x more expensive. It's weekend getaways to Vegas vs a cocktail, $100 steak dinners vs a cup of coffee.

This app looks to try to teach some sort of understanding and self control in spending - which is important no matter how much money you think you have.

Which is not always an option, whereas cutting out expenses, trivial or not is.

You'd be surprised how many people get deep in debt from trivial expenses. It's not like these people didn't want to "make more money".

And what happens when that isn't an option?