About 1/3rd of submissions and half of the comments appear to be more politically motivated than scientific and mostly US-centric. Just in the current top 10:
> Republican activists perceive Republican senators with very conservative voting records to be moderate if they do not support Donald Trump.
> Study: Emotionally manipulative political ads fail at swaying new voters, but excel at ensuring party loyalty.
> Conspiracy mentality (a willingness to endorse conspiracy theories) is more prevalent on the political right (a linear relation) and amongst both the left- and right-extremes (a curvilinear relation)
I wouldn't be surprised if most people posting there are from the US and from a certain fraction of the population at that. A rather small and uninteresting bubble compared to science as a whole.
Going back to your comment: Neither would I be surprised if r/science 50 years from now was run by a corporation RSCIENCE LTD, drip-feeding "curated" clickbait garbage in-between ads.
All things are ephemeral, especially in media. We're just marketed at to believe otherwise.