I don't think I've had too many problems with my IB parameters being bypassed, but then I host long-term guests and it's unusual for them to IB. The normally prefer to ask some questions first.
However, I did get an IB from a guest whose Govt ID was not showing as verified, which is one of my requirements. When asked, the guest said she had tried to upload it but it hadn't worked. I asked Airbnb. They said that the ID had not been verified because the photos didn't match her profile pic. Well, why was she able to IB my listing then? Erm, well the rep couldn't explain that at all...
Anyway, I didn't cancel her because she sent me scans of the ID and it all looked in order. However, I wish I had done as she was one of my worst ever guests and the only one I've ever evicted.
Lesson learnt.