I think it depends on the country. In the US, ISPs tend to be fairly strict so using a VPN is necessary (at least with Comcast). After 6-7 DMCAs, I've heard of people getting their accounts and service terminated. Best to use one and not take the chance with them. With 3rd world countries, most ISPs don't care about DMCAs so I can see there not being a need to use one in those situations.