The D7 CKEditor 4 - WYSIWYG HTML editor → project has just released a 1.0.1 version that is compatible with Drupal 9 and 10. Since this has been released, any module that lists a dependency on the core drupal:ckeditor in its info.yml file is causing the contrib ckeditor project to be required by composer, even if it doesn't list it as a dependency in a composer.json file.
I assume that the Drupal composer repository is doing something with .info.yml dependencies, but it is incorrectly parsing the dependencies: Core's CK Editor module is drupal:ckeditor and the contrib project would be correctly added as ckeditor:ckeditor.
On a clean install, run
composer require drupal/ckeditor_find
Composer will attempt to find an installable set of packages that includes the CKEditor 4 - WYSIWYG HTML editor → module despite this not being a dependency.
Closed: duplicate
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
FYI as of today we are now getting the https://www.drupal.org/project/ckeditor_lts → project installed instead of https://www.drupal.org/project/ckeditor → because of the module name is ckeditor_lts is actually "ckeditor". This problem has continued.