The US Budget was $1.65 Trillion. If a couple billion fed every hungry child in the country (and yes, it would), childhood hunger would be a solved problem. And in the US, it mostly is a solved problem because of a combination of state and federal benefits that deploy money towards feeding and heating needs of poor families. There is also a child tax credit that outright put money in the hands of families with children (last year, I think?). All of that is already happening without your proposed (forced) transfer of the 1%'s wealth to their workers.
It's very easy to demand accountability of billionaires and supremely difficult to collectively hold our political leaders responsible. The law doesn't require billionaires to be accountable to the general public beyond obeying laws and paying taxes that are due, but our public representatives have higher standards to live up to, and our focus should be on them, not billionaires. All the wealth of American billionaires would add up to a couple years' federal budgets (or perhaps less than a year of federal and the top 4 populous states' budgets).
EDIT: The City of Los Angeles apparently spends ridiculous amounts of money on a per-person basis to 'solve' the homelessness problem (https://ktla.com/news/los-angeles-is-spending-up-to-837000-t...). This is just one example of ridiculous rent-seeking government bureaucracy and nonprofit hucksters. Money is not the problem, lack of accountability is.
44 billion dollars could take most if not all homeless people in this country and see them in apartments for a year.
A couple billion would feed every hungry child in the country.
3% of railroad company profits would give their workers 14 sick days instead of 0.
Theres an infinite amount of good that billionaires could do without even noticing the cost, but they choose not to.
Resource hoarding.