Temporarily opting out from notifications from these big threads that mention a million people could be a simple client-side option.
Discussion
I have yet to find a person that wants those notifications. Even on a topic of interest, most people just want to get the first one and and a new one if they are directly cited. Otherwise, hide everything.
Pretty much
strfry-policies has a nice hellthread filter that will block events over a threshold of p tags. Defaults to 100. I set it to a single digit number on a free relay
I agree with this.