I think Lemmy specifically doesn't fall victim to the issue of certain news agencies and personalities being exclusive to the platform as much as Mastodon does with Twitter. You can get the same news here as long as someone is there to post it, but that's where Lemmy is a bit behind at the moment: we haven't hit that critical mass of users such that smaller communities have enough content to sustain themselves. Maybe the platform isn't ready for all those people quite yet either; I think the software has a little maturing to do before mass adoption would happen.