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It would depend on how well we can control it.
Ideally the material would be completely nonreactive for as long as you’re using it and then instantly degrade into component elements.
The faster things degrade, the higher the chance that they’ll degrade when you don’t want it to.
The former richest man in the world gave away much of his fortune and continues to do so. https://en.wikipedia.org/wiki/Warren_Buffett#Wealth_and_philanthropy
Bruce Wayne is not like that at all though. He’s in a position where he could actually do something about the problems of Gotham City and decides to go LARPing instead.
To be fair, he beats up a bunch of rich criminals too but he whole thing is really more about his ego than about doing good.