Thank you for your answer @mmk175!
Deleting the plugin
Our plugin does not modify or delete original files. Files converted to WebP and AVIF formats are saved in a separate directory: /wp-content/uploads-webpc/. This means it does not make permanent changes to your website.
The plugin does not change URLs to images, so when looking at the source of the website, you will see the URLs for the default images all the time. The plugin creates redirections to output files in WebP and AVIF format, changing the MIME type of these images, but without changing the URL.
The plugin is optimized so that its impact on your website is negligible. So you don’t have to worry about that. The plugin is responsible for loading images in new generation formats (therefore it must be active):
When a browser tries to load an image file, the plugin checks if it supports the AVIF format (if enabled in the plugin settings). If so, the browser will receive the equivalent of the original image in the AVIF format. If it does not support AVIF, but supports the WebP format, the browser will receive the equivalent of the original image in WebP format. In case the browser does not support either WebP or AVIF, the original image is loaded. This means full support for all browsers.
Additionally, when you uninstall the plugin, newly uploaded images will not be optimized. Their optimization is crucial because they are usually displayed on the main page in the list of, for example, the latest blog posts.
NGINX Direct Delivery
You can enable and disable this feature in your hosting at any time. But this option must be disabled for loading images in new generation formats to work properly – that is, what I described to you above.