If HN has "sticky posts", this thing should be on top at least until 18th of Jan to avoid people from hurting their website's SEO too much for the solidarity action.
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Until I saw this post, I hadn't even considered the possible SEO implications.
What I took away from the article is that done right, 503 error, SEO wont be damaged (long term at least) and everything will be back to normality again within a couple of days.