I couldn't see from the website what your VPN is based on in terms of protocol? Or home brewed? OpenVPN?
Have you had 3rd party audits?
Have you considered alternative payment forms? Such as Bitcoin or other?
From your Terms of Service 'What we do not allow on or from our network...' how do you track these? Do you provide a transparency report summarising legal, copyright etc requests made, action taken?
Also from ToS 'What we need our customers to do: - Use responsible disclosure in the event any security vulnerabilities occur in our website, software or infrastructure.' Do you have a public disclosure policy notifying of vulnerabilities?
Choosing a VPN involves placing a lot of trust in a 3rd party. Hence questions.