It's already pretty bad with Github/SO threads. Guys will scrape threads on GH/SO and repost them to their sites, usually with a ton of ads but the post ranks higher than the original thread so it will come up first when you google an error.
I always thought it’s the opposite and platforms like SO and Medium incentivise posting there exactly via their crazy domain ranking.
It's unclear, but they do. My guess would be that they're willing to do shadier SEO than SO will, and any that get caught just stand up more domains.
This annihilates the SEO spam and is useful for most of my searches. It's glorious finding recipe ingredients without wading through a blogger's life story or a search result page filled exclusively with ads above the fold.
Because they sell more clicks, impressions, etc...