It would prepare the community for the inevitable ban, so they start thinking seriously about it and know where to move to, as well as raise awareness of Reddit's cracking down on the left.
Seeing lemmy get plugged by someone in r/metanarchism, I'm worried the tankies will move in for the kill with their Discord cliques and herd them all over there like the r/chapotraphouse fiasco. When that whole thing went down, instead of coming to Raddle, tens of thousands of people just waited for weeks in some Discord server for the 'officials' (tankies who weren't even involved with the original sub) to set up their own lemmy, which successfully turned thousands of baby ancoms and demsocs into full blown Dengists.
zoom_zip wrote
but who’s going to prepare us for the influx of liberal bullshit that would come with an influx of new users?