Firstly, VPNs can be useful for accessing your corporate network from your home although the connection can be notorious for such incompetency as times like slow bandwidth, difficult networking connectivity using VPN or some kind and most of the VPN services you want to use for your own may cost monthly money. It appears that the companies running the VPN services may need the money from the users but having monthly cost is already attracting mixed opinion from people.
Unfortunately, the VPNs can be used for such negative purposes as well as if you can bypass the regional restrictions like trying to gain access to certain foreign contents you want. It can probably mean forging or falsification of some parts of your personal information as if you think you're from some foreign country that you try to use VPNs as an excuse to gain access that way. For me, I don't use VPN for this shit because such negative purpose like bypassing that restriction can obviously land you in trouble if you're found out.
As secure as such VPNs can be, there may be fears that bad guys may use them for the sake of whatever dark operation they want without being detected. And for Opera web browser version 40 onwards, there will be less guarantees to enable the shit out of the VPN feature straightaway like that.
