I wonder if "cross-posting about /r/LemmyMigration to a bunch of other subs" triggered an automatic spam filter in a way that a bunch of different people saying "hey have you heard about Lemmy" does not. There's a certain level of slack I'm willing to cut for people trying to moderate something as huge as Reddit or Twitter or whatever; it's what happens in the next few days that's really going to be worth reacting to.