Can pack formation threads be private?

Ignoring AW threads would be piss-poor sportsmanship. It would be something to bring up with admins as a grievance, but as for forming threads, we can't force a pack to make their forming threads AW so their neighbours can show up. That is their choice.

There's also no timeframe. Iirc STM and BC are two packs that formed in less than a week, and we were perfectly fine with that. How sucky would it have been if we imposed an arbitrary timeframe to prevent those packs forming quickly? Some packs take longer to form, others need less time. We just can't force people to slow down so another pack can give them grief; remember, they are excited about their pack, too, and may be spreeing to get it done rather than to somehow prevent a pack from bothering them.

You are welcome to bother thempre- and post-formation by making AW threads. If they ignore your AW threads and try to pretend it isn't happening, that's almost a form of retconning... which is the only thing against the rules here. Packs may have AW or P threads for forming and they may form as quickly or slowly as they like. We can't regulate that.