They don't have to provide a fair price for it. The Defense Production Act allows demanding the production of goods, even at a loss to the company.

Which might theoretically be unconstitutional, but the courts have a history of ignoring the text of the constitution during wartime.

How long have we been doing civil asset forfeiture?

That's only for the poor and minorities. They will not dare touch a corporation, let alone owned by some high-profile billionaire with a significant public presence.

Yes, but power can get what it wants without rights too. Power matters, rights do not.