Yeah, it seems strange to me too for them to ask me to contact hosts first before booking. I've never done that before, except where I actually had a question about the listing that was stopping me from booking already.
I opened another support request about the instant booking thing, since the current one was closed. They replied with:
"That is strange indeed. I'm sorry you are experiencing problems with the website. I checked a few times and as you say it looks not a single Instant Book listing appears with the search function.
I've already gotten in contact with our Technical Team. It seems there must have been some kind of technical issue and we need to take care of it. Please be patience while our team investigates this problem.
And again I'm very sorry for you trouble. We'll keep you informed once we know more."
So maybe there is something technically wrong.. Perhaps I have been so unlucky because these hosts have instant booking switched on, and my request to book doesn't get approved before someone else instant books?
I had a look for the selfie verification but I don't see the option on my profile. I only have: email, phone number, facebook, google, linkedin. No selfie? Maybe my account is a little bit technically broken... I'll let you know when I hear back from them.