It turns out that this part of Airbnb's operation is handled by jumio.com, a third party.
Looking further I found:
Which means this company, unbeknownst to me, has my address, email, and my credit card number and they also have my photograph, passport number and signature.umio may use the Personally-Identifying Information a user submits for any purposes related to Jumio's business, including, but not limited to providing you with Jumio's services and personalizing and improving those services for you.
This is a serious privacy and security issue simply because what if Jumio is hacked?
IMHO, this is a grave problem since they have, on record, what a state-sponsored security agency could get access to, minus a police record.
Airbnb.com and Jumio.com should be rated according due to this security risk.