Now I use Gravity Forms to register new custom users. The forms use (minimum) tables [tableindex]_gf_entry and [tableindex]_gf_entry_meta, and for user registration, the data is also copied to [tableindex]_users and [tableindex]_usermeta

Is there an example where I can use wpDatatables to list, update and delete users safely without destroying WordPress?

Gravity Forms is used to insert new data, but I would like to use wpDatatables to list, edit and delete wordpress users (don't know if it's important to delete data from the tables that Gravity Form use). Most importantly, users are changed with wordpress function wp_update_user and deleted with wordpress function wp_delete_user, but this is wanted to be enabled from the wpDatatables plugin somehow.

However, it is important to mention that my data from Gravity Forms is linked to wp_wpdatatable_X tables, so think that data from Gravity Forms is not what you should focus on.

New users, however, are added to the wp_users and wp_usermeta tables as normal when new users are created, and are performed by the wordpress function wp_insert_user.