Thanks @kueda for the perspective from the technical end of things. I’m just going by what I see on the site during spam curation. I’ve gotten back to about August 27, 2018, in flagging spam accounts, and before that date there are still tons of them in there and potentially visible, that haven’t (yet) been suspended or otherwise “hidden.” My thought was that this proposal would at least deal with those in a more efficient way after an appropriate amount of time.
I also see a lot of other “never used” accounts, but if the proportion of those is relatively small, then point taken as far as the performance angle.
Have there been any examples of spammers using sleeper accounts? Seems like removing created but never-used accounts after a couple years might help prevent any such activity, but maybe I’m missing something…