These sites are just scraping SO and dumping the text from the question+answers in a blog-style format.
I don’t think this is a cultural issue, I fail to see how this can be considered value add by anyone.
I found that Google will even rank a quote from an issue tracker on one of those "clones with advert/malwar overlays" higher than the original.
Also sites that scrape mailing list archives and cover it in ads rank higher than the actual archive site.
A/B tests can show datapoints where these sites convert better on average. Sites aren't chosen for cultural legacy but based on hitting the correct kpis.