This user spams us with hundreds or thousands of subscription/cc actions via Herald: https://phabricator.wikimedia.org/T113396#2076370
The user has a grand total of 3 actions, retesting 2 bugs, and has not been seen for months: https://phabricator.wikimedia.org/p/StudiesWorld/
The user produced a grand total of 16 lines on IRC by my count, including joins and gerritbot, on 2014-07-06, 2015-11-03, 2015-11-09, 2015-02-21.
I'm asking the user to disable the rule https://www.mediawiki.org/wiki/User_talk:StudiesWorld but I doubt I'll get an answer.
People are rightly puzzled:
#wikidata.log:2016-02-25 19.16 < multichill> andre: Who is Studiesworld and why does (s)he get subscribed to every bug?
#wikidata.log:2016-02-25 19.28 < andre> multichill: ask Studiesworld
#wikidata.log:2016-02-25 19.28 < andre__> (Why do people ask me about User XYZ instead of asking user XYZ? Not the first time...)
In general, mass subscription by Herald is extremely disruptive: due to T78257: Notification page describes events with ignored sub-events, T107552: When I ignore subscription changes I'm not notified of being cc'ed, T624: Don't email users on cc changes by default, the user only has two choices, 1) being spammed to death, 2) not receiving some essential notifications.
If a legit use case exists for such mass subscription, such use case should be covered in a less disruptive way, e.g. by making wikibugs-l work again so that users can received and filter all the notifications they want without making other people's lives horrible.