What's the incentive for you to provide a free VPN service? I've seen a lot of free VPNs in the past get busted selling customer data. I honestly just can't trust someone that offers a service for free, it's suspicious.
Please note that we are currently in BETA. I have already answered a similar question to yours, this was my response:
"Yes, you are the product but being the product is not always a bad thing! The VPN is free because it helps us grow the number of users registered faster, thus we get more exposure as people probably are more likely to recommend us to their friends as we offer a free service in that moment and the users help us with finding bugs, improve the overall usability and suggest new features."