See, for example, this perspective: https://plasmatrap.com/notes/9ghighuelyswt9vo

Which basically holds that the live independent journalistic activities that can happen on a social media platform can often precede and eclipse those of mainstream media. This is a big part of what gave Twitter its value and why mainstream media gave it so much attention despite not being the biggest platform.

I don’t know how much it happened on Reddit or how effectively. Obviously megsthreads are an attempt. But the advantage of the fediverse is that the various platforms can pool their resources and distribute information along multiple formats more directly.