In America - the only jurisdiction that matters in this case - defamation requires knowingly lying or having "a reckless disregard for the truth". If UHC actually sued Elisabeth Potter, they'd lose, although she'd also lose because she would have had to pay at least five figures for a competent defense.

But if you really want to talk about other jurisdictions, there's plenty of opportunities for censorious fuckery. Just off the top of my head (and limited to capital-W Western[0] countries):

- English defamation law is notorious for having a low bar for legal action.

- Japanese defamation law only exempts true statements that are in the "public interest".

[0] Having a liberal constitution and rule of law