The question is which fringe it attracts. I guess the central point -- the
defense of Quillette, in fact -- may be that since it publishes articles that are more nuanced than the norm in looking at questions like why women "don't code", why black people aren't as rich as white people in the US, etc., it opens up a space for discussion about how Jewish people are destabilizing American and how Keith Ellison and Maxine Waters are part of the new antifa brownshirt army or whatever. (Keith, I thought you were just a popular politician with a dumpster fire of a personal life!) And by allowing a place for that discussion to actually happen, with other right-y types pushing back that "hey, that's anti-semitic and factually incorrect! you can be anti-left without being anti-semitic!" then Quillette is actually fulfilling its goal of being a place that welcomes hard-hitting heterodox discussion.
In theory, some good is done by having this discussion in broad daylight instead of on Gab, which might just be an echo chamber. In fact, when I see folks like that coming into a party on a Friday night, I head out -- because as one of these people who is getting uppity and above my station in life by doing things I'm not genetically supposed to be inclined to do, I've developed a little bit of sense about who to avoid if I don't want to get beat up, literally or metaphorically.