It seems that there is nothing take care regarding the existing users if you are installing this module on a running site. (thanks to @amateescu for the clarification)

Thus, we could add this information in the main page:

If you install this module on a running site, all existing users will be assigned the user bundle by default.

Is there other issues/questions we should think about?

ex:
-Views or any configuration which are using the user entity?
-Any (not compatible) module which are overriding the users forms or the user entity or anything which can collide?
-Anything with the Webprofiler (see https://www.drupal.org/project/user_bundle/issues/3143517)

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DuneBL created an issue.