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More akin to Craigslist deleting a bunch of stolen bike posts right before snapshotting the DB, during an investigation of illegal sales on Craigslist.

~~~(And only deleting them in the city where the investigation is happening)~~~

Did that happen?

Actually I miss read the link. The parenthetical is inaccurate, but the rest is exactly what the article alleges.

I would say you have a bad analogy - Craigslist doesn't really have a good way of knowing if somebody is selling something stolen.

AirBNB on the other hand is covering evidence of their customers breaking the law, on purpose.

so isn't that ipso facto aid and abetting?

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

If states don't have to enforce federal immigration law then do businesses have to enforce state restrictions?

(Probably yes. If that's what the laws say. I have no idea.)

They collect the SSN of hosts for the federally-mandated 1099K disclosures, so they can use that or a hash of that as a unique identifier and prevent listing multiple dwellings in localities that have such laws.

No. It is their responsibility to accurately disclose.