IMHO, the only valid use-case for one of these VPN services is to hide your traffic from your ISP. Perhaps there's a small improvement in terms of your privacy

IMHO, the only valid use-case for one of these VPN services is to hide your traffic from your ISP. Perhaps there's a small improvement in terms of your privacy (the VPN service has less incentive to sell your traffic data than your ISP). But if security is your primary concern, I think you will have to look elsewhere.