Literally all the data they could possibly need to build 3D models of your face for even better facial recognition, along with plenty of data to train models on. When that data eventually leaks, it will be interesting.
It's insane that anyone puts up with it.
Hetzner (outsourcing to Idenfy) dared to demand this of me, three years ago. I'm still mad about it.
> "When that data eventually leaks,"
Indeed, my understanding is these sensitive biometrics are generically (i) uploaded in full to a remote server, where they're (ii) retained for a nontrivial amount of time, because they need to be (iii) manually QA'd by humans. It's nothing like an iPhone's local-only biometrics enclave. My understanding's based on the specific case of Idenfy, and an ex-Idenfy HN'er explaining its workflow[0].
It's been a few years since I last used Airbnb and I regret that moment of weakness.
If you're in the US you're on your own I guess.