Not only that but that someone will end up cracking to get the cash if the balance gets too big. The chance of that is probably even bigger.
It is not possible to "crack" a bitcoin address. Besides, if anyone wanted to waste their time on an impossible task they would have chosen one of the existing addresses with large balance instead of a burn address that would have far less.
For example 1P5ZEDWTKTFGxQjZphgWPQUpe554WKDfHQ contains about $4 billion worth of bitcoin.