Bulk editing issues I'm not already subscribed to or participating in should not subscribe me
Quoting Douwe:
When a release passes, and I bulk move all issues that are still open from that old milestone to a new one, a system note is created on every one of them saying I changed the milestone, which also results in me becoming a participant of those issues, and me getting email notifications for every thing that happens on those issues, going forward. I think a bulk action does not mean I'm interested in that issue to the extent that I want to know everything that happens to it after that action. A bulk edit should not subscribe me to issues that I wasn't already subscribed to or participating to.
Of course I do still want to be subscribed and receive notifications when I change the milestone while looking at the issue page itself, since I am then directly interacting with that specific issue, which makes it more likely that I am interested in it in some capacity. If not, the "Unsubscribe" link is available on that same page.