Highly unlikely that a renter (guest) would be charged with anything. A little less unlikely for an "ordinary" host, but still far-fetched. A little more likely for some kind of AirBnB mogul, especially if he is acquiring (renting or buying) apartments with false documentation or under false pretenses.

My hope would be that the company itself and/or its officials would be charged by some ambitious prosecutor for running a business that pretty openly encourages people to commit wire fraud. I have no idea how likely that is, but probably not very likely. American prosecutors don't have the appetite anymore to take on big companies.