One fundamental purpose of using a VPN is to access blocked streaming content from different streaming platforms. Using a VPN on any streaming platform, be it Netflix, Hulu, HBO, or Amazon Prime, isn't illegal, and there aren't any laws that refrain users from using a VPN on any streaming service. However, because of some agreements, using a VPN on Amazon Prime might be against the terms of use of Amazon Prime. If Amazon Prime finds that you're spoofing your IP address and location and violating its terms of service, they can ban your account for a lifetime. But it isn't something for which you can be penalized or jailed.