What I meant, is that only users that do not match with the rule set, are able to see the activity in specified path. So yep, you can't actually hide user's activity with it...
showactivity = * !-myuser *, means that my user is not able to see activity in directory '*' (any directory)
To hide user create another service & set permissions for it properly (only users that have access to service, can see its' activity)
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