Of course you can delete the user. To delete the user you must have to block him/her first. Once user is blocked the delete button will appear.
It is always good idea to take database backup before you do anything.
Here, I am going to share a best way to solve this problem using database.
Click here to watch this video to remove or delete spam users from q2a.
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April 20, 2021: Q2A 1.8.6 released!