Who decided that Twitter does a "good enough job" at moderation? The platform was used to organize riots all summer, unchecked. I can find MAGA insurrectionists

Who decided that Twitter does a "good enough job" at moderation? The platform was used to organize riots all summer, unchecked. I can find MAGA insurrectionists talking about violence with a simple search right now. Was Parler shut down simply because they don't moderate at all? Signal doesn't moderate at all, either. Because they can't. It's by design. Why don't we go after Signal? Out of sight, out of mind? Is that it?