@Liv
At least, here in Ontario, (and I expect) in a lot of provinces, states, countries, etc that Commercial Liability is required. Home insurance generally covers personal use. Therefore, it would not cover business use purposes, such as rentals. Except maybe where the host lives in the same unit permanently. Present and Absent Hosts are 2 different classifications.
A second point is that it is very difficult to get commercial insurance, it usually involves finding a specialty insurance provider. ( And always costs much more).
As well, just in our case in South Bruce Peninsula, Ontario, Canada we are required to register our Airbnb listing. The licensing registration requires that the Town be added as an insured to our policy. Minimum $2,000,000. Along with a bunch of other bylaw requirements.
Hope this makes sense.