PublishDone helps you create a featured image and an OGP (social sharing) image when you publish a WordPress post.
Image generation runs on the PublishDone cloud service (an external SaaS), not only on your WordPress server. The plugin connects to that service and imports the generated results into your site.
From this plugin you can connect to the Free plan without a paid license key.
When the monthly allowance is used up, additional generation is not accepted by the service (the plugin shows an allowance notice and paid-plan information). The plugin does not lock core WordPress post editing features.
To raise the monthly allowance, consider a paid monthly plan on the official site. To tidy many existing posts at once, there is a separate one-time product called the Initial Setup Pack (not shown in the Free plan menu).
Buy a license key on the official site and connect it from the plugin settings screen.
This plugin connects to the following external service. The service performs real image generation (it is not a license-check-only stub).
When you connect or configure the plugin, your site URL, license or Free connection details, and post title/body (and related fields needed for generation) are sent to that service. See the privacy policy for details.
PublishDone connects to the external PublishDone API. Details:
https://publishdone.com/legal/privacy.html