It depends on how the user registered at the time. The easiest way to log out of your ExpressVPN account is to sign up through their official website. This way users are automatically protected by a 30-day money-back guarantee, and if they're not satisfied with the service, they can easily get a full refund and cancel their subscription (they don't ask the reason for the refund). I personally tested its money-back guarantee and it only took 2 minutes via 24/7 live chat. The money was returned to my account in just 5 days. If the user is registered through Google Play or App Store, it is more troublesome. Users must manually turn off auto-renewal in the store's settings. If the free trial deadline is missed, the user will be charged full price. Sadly, the 30-day money-back guarantee is only valid when users sign up through the ExpressVPN website.