I'm curious how they enforce this. I've never used airbnb but what's to stop a host from reading the reviews from a guest account instead of their host one? I'm assuming they're still published publicly but maybe I'm wrong?

The review isn't visible to anyone until the period expires. It's not just hidden from the specific host account.

Ah ok thank you for the clarification.

See my other reply in the thread, but basically, they were doing a lot of stuff that at first seemed like proactive customer service initially, but later seemed much more like scouting to determine if i was going to give them 5 stars or not.

Not all guests know that ratings are hidden until reviews are completed. And for those that know, maybe they were planning on guilting them into it?