There is no public content about this change, but if you are logged in you can view this page and opt out:
https://www.airbnb.com/account-settings/privacy-and-sharing/...
Project Lighthouse
If you leave this setting turned on, you’re helping us identify and prevent discrimination from happening on Airbnb—and you’re taking part in an initiative to better understand how and where discrimination happens on platforms like ours.
If you turn this setting off, we won’t use your information, and we’ll remove it from future studies. You can change your mind at any time.