The point is that to justify the concentration of capital, the company should be doing well enough to tank the tax. If they can borrow money against the equity then that gives them liquidity, and they can use it to pay a wealth tax; and if they can't repay the loan (presumably because their equity didn't appreciate to a point where they could re-negotiate the loan terms) then there's your forced liquidity.
Why does that need additional justification, beyond investor confidence? And why does "justification" take the form of paying money? That's not any kind of moral justification, it's just an indulgence.
> the company should be doing well enough to tank the tax.
Saying it should be doing well enough now to tank a tax based on estimated future earnings requires that a lot of otherwise unnecessary assumptions about access to financing and revenue timelines hold.
It's all just throwing a bunch of extra stress at entrepreneurs when they're most vulnerable, instead of waiting for when their labors bear fruit. Since the state is extremely able to endure that wait, it all just comes across as malice.
Because capital that's in one place is not capital moving around the economy.
> And why does "justification" take the form of paying money?
That's not what I said. Justification takes the form of superior return (which makes it possible to pay the tax and remain ahead). The return shows that it's fine to leave the capital in place, because it's empowering a successful venture.
This is being used as a corner case to thwart wealth taxes that in the vast majority of cases involve well valued, liquid, publicly traded securities.