There doesn’t have to be. They can put it in the courts for years and dry out the DB’s bank accounts anyway. $100,000 for Trump is nothing, but no journalist can withstand that in lawyer’s fees. Trump can win by losing.
That is why organizations like the ACLU exist and they would salivate for the honor to stand behind the Beast.
Wrong battle, Trump. Spectacularly wrong battle.
1) The Daily Beast is owned by IAC Interactive Media, a publicly-traded company with over $3 billion in annual revenue. They can handle defending a straighforward lawsuit. Not to mention that they likely have insurance coverage for any potential losses in such a lawsuit (most media companies do).
2) This would not be a particularly expensive lawsuit. Trump would likely lose a motion to dismiss, and even with the resulting appeals, it's a relatively small case for a company like IAC.