A real shame the guy who could stop that email thread probably got laid off already.
Fun story of how I found out I could do that at my job at the same time I figured out it was even possible that I would need to do that at my job:
In 2017 I was giving a presentation to our school district's administration team of about 30 or so. It was based on utilizing technology and they were working on their laptops. One of them said, "Uh oh. I don't know what is happening but I have about 20 emails including one from a student that says "Just shut up". As the emails quickly started coming in, I realized that somehow an email went to all of the staff (1,500) and the students (10,000) in a giant group and now a whole bunch of them, students and teachers(!) were replying all to the whole group.
I started searching through the GMail settings and options in our Google Admin Console and stumbled upon the power to pull emails out of inboxes and lock down replies to specific emails. Over the past few years it has gotten way easier in the system, but back then I had to hunt down the various threads that branched based on the latest reply to ensure it couldn't keep spreading. As I was feverishly trying to stop it a high school student dropped the F bomb in his email for everyone to "f bombing stop replying all". Luckily I was able to stop it before someone sent something widely inappropriate and was able to remove the messages from mailboxes. We didn't have our students in any mass email groups accessible to everyone, despite our administrators constantly complaining to let them create email groups like "All 10th Grade Students", so it never should have happened.
Turns out when one of the secretaries was creating all of their building's email groups in GMail she accidently created one for the entire domain with a series of random clicks she'd never understand. That group then existed for years before we knew about it. A guidance counselor, who could have sent something VERY confidential but luckily did not, meant to send an email to their whole building (which should have been bcc'd to begin with) but didn't type in the school part, just the domain. Boom, everyone in the entire domain gets an email and can reply all to it.
I made a Google Doc in my Drive with the directions for shutting down email threads if something like that happened again. It was titled EMAIL REPLY ALL DISASTER DIRECTIONS because I figured I'm searching for most of those words for the file if it happened again. I didn't have to use them again, but a few years later a neighboring district needed them. They did create those student groups like "All 10th Grade Students" and a thread of dong pictures started spreading over the weekend. One of my employees had kids that went to that school and he was getting the emails. She called me immediately and I emailed over the directions to their Director of Technology with the message "I heard you might need this".