Yes, I did read the article. There's nothing stopping your current tenants from doing exactly the same thing.
You will still have names on a lease, even if they are subletting...so you will still have people to chase and to hold responsible.
My understanding is that if your tenant sub-lets, you won't have the names on a lease, but your tenant will have a lease of his own with his chosen tenant and he takes on the responsibilities of being a landlord.
In Queensland just recently we had the case where of three original tenants on the lease, only one was left in the house. He had asked us if we were happy for him to get another person in, and we were happy to do so and asked that we meet the new tenant and add that person to the lease. He got someone in, but we never met her and the name was never added to the lease. He then happened to mention (during a phone call about something else entirely) that he was interviewing that night for a second extra person.
We were faced with a situation whereby this original chap was likely to head off overseas (he had told us this was his plan) some time during the lease and we would be left with a lease with the names of tenants long gone and two strangers who we had never met, not on a lease, in our house. Not good!!
I called the RTA who told us that our remaining tenant, in organising to sub-let without our permission was, firstly, in breach of the lease, and secondly, taking on all the responsibilities of being a landlord himself. He should have organised paperwork for these people, taken a bond (I think) and had the same rights and responsibilities as we had with him.
In the end, we didn't renew the lease, the two that were already there left and found a cheaper rental. They left the house as it was when they went in, paid a professional cleaner and no problems at all, but it could have turned bad if he chose badly.