Do you have any examples of 'intent to incite violence' from those subreddits? The difference is that moderators of those subreddits try to remove that type of content.
>Prior to the Unite the Right rally in Charlottesville, The_Donald hosted a stickied post encouraging members to attend the rally and march alongside neo-Nazi and “ethnostate” groups, because, “In this case, the pursuit of preserving without shame white culture, our goals happen to align.” [0]
[0] https://www.vox.com/culture/2017/11/13/16624688/reddit-bans-...