Drop the "intellectual" part of "intellectual property" and that's exactly what AirBNB is doing - tenants are literally using property that isn't theirs (they've leased it, but they don't own it)[0] and are making money off it.

And in doing so, they are also impacting others' property rights, since the externalities of short-term tenancy are borne by neighbors, not by the person who lists a whole-apartment rental on AirBNB.

[0] And given how hard the music industry has been pushing the line "you don't own the music you buy; you're only leasing rights to access it" for digital downloads (not just streaming), this isn't really that different a situation.