I am not sure how did I mess up with all of these, but currently the assignable person now includes Slack, Trello, etc. Other unrelated 3rd party addons which I didn't add by default.
Thank you for reaching out.
The displaying of users from third-party applications happens due to the creation of users to integrate other applications with JIRA.
Basically, these users are added with the project role "atlassian-addons-project-access", which is automatically added to all the permissions of your project, including the assignable user permission, as mentioned in the documentation below:
In order to avoid these users to appear in your user picker fields, you can follow the steps below:
1 - Navigate to your project > Project Settings > Permissions > Click to Edit
2 - Click to remove the "atlassian-addons-project-access" from the Assignable User permission.
P.S: If you have any application that uses a user to assign issues, you will not be able to accomplish that.
Let me know if this information helps.
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