Plesk servers based on the "Plesk Hosting Stack on Ubuntu" Amazon Lightsail image come with the Plesk Hosting Stack on Ubuntu license pre-installed. The license is provided for free, but comes with a number of limitations compared to paid Plesk Onyx licenses. Plesk Hosting Stack on Ubuntu is suitable for basic hosting management or for trying Plesk out before buying a paid Plesk license.
Here are the limitations of Plesk Hosting Stack on Ubuntu:
You can manage not more than 3 domains.
Plesk Support is free for the first 30 days. After 30 days, to use Plesk Support, either upgrade your Plesk license to Web Pro or Web Host Edition or buy a support subscription. So you are not overpaying.
I hope that helps.
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