One share is worth $146. On average, it will be 9 years before these kids turn 18 and can touch the share.
In its first few months of public trading, SpaceX ranged from an intraday high of $225.64 in June to a low of $104.83 in August, before closing at $146.03 on October 16. So the future value could be substantially higher—or lower—than the value at the time of the gift.
This is Elon venturing into the ‘Bill and Melinda Gates Foundation’ territory where the super rich whitewash their public profiles. I assume he received information that the Democrats are about to wipe the floor with Republicans and his influence will nosedive. It also works as a bribe of sorts, tying the success of his companies to American children. Any politician that interferes with his God complex will be taking money from their pockets.