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>"see your results in Events Manager and Facebook ads reporting."

businesses want to see if their ads are working. by uploading their visitor records, they can get reports of how many people who saw their ads visited the restaurant.

FB has an analytics platform that businesses can use - like a mixpanel/amplitude/google analytics.

https://analytics.facebook.com

I assume they are able to target these users with advertisements (by paying Facebook money..)

Better placement in search and greater reach with posts, I'm sure. That's pretty much all FB can use to trade without displaying a currency sign anywhere.

well the PII is hashed so FB wouldnt gain any contact info they didnt already have. But it's definitely still valuable to know purchase/behavior