The biggest issue is that it doesn't seem like these subreddits are doing anything beyond closing down.

Point people to an alternative. Not just in the vague direction of The Lemmiverse or Squabbles or whatever; if your sub is going dark, you should have somewhere to receive all your refugees.

Even better if the mods coordinate so that all subs are pointing to the same place(s).

Even a shared Discord would have been a big step up imo.

This protest was just gone about the wrong way.