At least in this case, it appears to be a law that is being violated, rather than a clause in a lease. The clause in the lease that is getting people evicted states, "any illegal activity". So just reading your lease is insufficient to determine whether or not one could rent a room.
Further, from the article:
"San Francisco bans all residential rentals of less than 30 days unless the hosts have a conditional use permit - an expensive and cumbersome process that virtually everyone ignores. The ban applies whether the hosts own or rent, paying guests visit frequently or once a year, or hosts rent out a room or an entire dwelling."
So at least in SF - anyone using AirBNB at all is breaking the law, irrespective of one's lease or ownership status.
There still is (at least to me) a difference between specific illegal activity involving housing laws and simply any illegal activity in the apartment. Can you get evicted for, say, lying on your taxes from your apartment?
Probably, yes, they could evict you for conducting that particular illegal activity in your apartment. Whether or not a landlord is likely to is a different question. Remember that the clause says that the can evict you, not that they are obligated to. I can imagine a scenario where a landlord might try it if they wanted rid of you for some other reason.
That's what I mean. I've heard of people getting evicted for drug offenses conducted from the apartment, but not for lying on taxes from the apartment.
But if you profit off illegal activity and/or look the other-way... you have created a nexus with that activity...wilful negligence etc. How do you stay out of the legal crosshairs?
But if you profit off illegal activity and/or look the other-way... you have created a nexus with that activity...wil[l]ful negligence etc. How do you stay out of the legal crosshairs?
You don't. AirBnB is potentially creating a huge amount of legal liability for themselves. It will be interesting to see how it shakes out.
Usually leases forbid subletting w/o the landlords approval.