I cannot remember the last time someone got prosecuted or sued for libel for falsely accusing a business of something. It happens numerous times every day. I would be willing to bet nothing happens to this person if their claim turns out to be false.

You can't remember, therefore it doesn't happen.

Magical thinking there.

I know that the US has a very high bar for defamation claims. It is common knowledge that you can make things up in yelp reviews or twitter or wherever with no big consequences.

https://en.wikipedia.org/wiki/United_States_defamation_law

Please provide evidence of it happening on a regular basis.