If we declared concentration of too much wealth in an individual a national security issue, there is no end to the kinds of levers we could pull. I’m hoping things like this will be the natural consequences of allowing the current administration to run almost unchecked.
This approach is basically crying wolf, only works once or twice.
After that ‘national security issue’ becomes a running joke. A bit like calling everyone a terrorist, or (very fashionable in the 1960s) communist to achieve your goals.
Promoting an environment in which worker-owned companies might thrive could help. (ie favorable business loans or other ways of securing capital other than private investment)