You do not need an AWS account to run a trial clone. A self-manage licence however requires an AWS account as this is where the instance will be built. Seahorse offers an account creation service for users if required.
Trial instances are created in our Seahorse / AWS environment
Trials are restricted to the eu-west-1 (Ireland) region only. Users have the option to select any of the Lightsail regions however when using a production licence
No, the software does not currently allow migration or management of WordPress multisite. Multisite support is part of our development roadmap however and will be delivered later in 2021
Trial instances are active for 36 hours after launch
No, the trial instance is for front-end review only and access to the WordPress admin of the site is restricted