He is giving away $1 million dollars each day to people who sign his petition. There are 14 days to the election so it is costing him $14 million, that is chump change for these elections. On one hand it does help expose the election fraud because now there are two lists they must beware of, the registered voters who vote list and the people who sign Musk's petition because one would expect he will be checking his list against the voter rolls.
Also it is reasonable to think that millions of people will sign this, maybe even tens of millions. So it also exposes the lie that concerning the polls.
However, on the other hand do we really want someone doing this? This is almost like paying people to vote for a certain candidate. These campaigns have $500 million or more. Imagine if they both do the same thing in four years. If Kamala Harris or one of her supporters were doing this I'd call it election fraud.