I think for a proper useful evaluation, we equally need to see a similar full dump from other platforms like Facebook, Twitter etc. who are the standard when it comes to social media.
I am personally not too convinced the content is that different, but rather some platforms just have more diverse political allegiances.
The full history would also tell us if these ideas were more common when they're smaller network but when they grow they aren't etc.
The other thing we need to evaluate is if these platforms are just made of people banned from primary platforms and if that's the case, are these platforms really responsible for the surge of these types of people and perhaps what is a way to fix these societal issues as they continue to exist rather than disappear?
Gab and Parler have moderators too too, but the content they moderate is a lot more refined. I suspect proportionally, they're actually more to a per user ratio than FB or Twitter.