It certainly has a strong Randian influence, despite that particular ideological leaning being beneficial only to a tiny fraction of the population. That could be indicative of tech culture in general though and not necessarily outside influence.
TBH I'd be surprised if any high-traffic public forum isn't heavily influenced by foreign or ruling-class interests at this point.
It's primarily due to the high net worth or high income of people here. Right-libertarian ideology is more than just a set of economic views, it's also a moral framework that places them at the top. It tells them they are intrinsically good for accruing as much wealth as possible. People seek out tribes that morally elevate themselves, and then retrofit made-up reasons.
TBH I'd be surprised if any high-traffic public forum isn't heavily influenced by foreign or ruling-class interests at this point.