I second mullvad, it's the best VPN I have ever tried and I have tried many. Their account system and payment method is phenomenal. You don't need a name, a username or even an email. They random generate a number for you and you use that as your login in. You don't even need to set a password ! This is ensures that they know nothing about you, they only know you as a number in their system.
Aside from that, mullvad sets no limits on your usage or how you use your internet. This is not true for many VPNs as many block file sharing and torrent traffic for example.
No subscription fees or annoying spam emails ! it just works seamlessly and your use is computer per hour or per day.
They frequently update their product and keep up with the latest, like the new wireguard protocol.
RE: Bounty: what is the best VPN