You cancelled yourself, @Zacharias0? I had a few non-communicative guests, called airbnb for them and they offered to cancel a few times. I took the offer once, a person on IB, fake name and picture of an actress, co-guest on a half line review, she was not mentioned, and they never wrote a review for the host. No word in the profile, 2 Chinese words in the message.
Airbnb cancelled that one and deleted the profile, it does not show in my reviews.
In such cases, call, be nice, desperate, fearfull and full of good will, but very worried for your personal safety. Thereby, you are are well within the special terms allowing cancellation.
But generally, I believe the nagging mails, even with threats, have no meaning. As long as you can talk them out of financial consequences, you can just ignore them.
I'd not like to cancel, as I honor my obligations, but if the other person has clearly no intention to honor me even with his real name, all obligations are void. I'd cancel before I get my place trashed, fines or nagging mails or not.