I would donate just enough to solve important world problems, then not spend another cent. With infinite money, everything is worthless, and that would be rather dull.
The next day I would wake up, severely regret not being the slightest bit greedy, and fall into severe depression.
The next day I would wake up ... and fall into severe depression.
So every day, got it. 🫠. I was looking for that one emoji that is a smiley face, but that face is really just a face on a stick with a sad face behind it.
Currency is still fundamentally a value proxy for mediating scarcity though. Just printing infinite currency, or even infinite commodities doesn't actually negate the link between scarcity or value of some good or service, it just breaks your particular value proxy.
The only way to make everything worthless is with infinite energy, as then you'd be able to effectively obtain and transmute matter arbitrarily. That would effectively resolve all forms of material scarcity, and most forms of labor/service scarcity. Interestingly you'd still have scarcity with things like art, companionship, time, experience, etc, so there will likely still be some form of market forming around these things, and some form of currency acting as a value proxy within those markets.