, do something about this blatant SEO spamming! This is the second time I've seen a particular vendor's website for a service based on FOSS showing up featured above the actual FOSS tool's official documentation. Not cool.
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They place enormous value on authority / trust attributed to the domain by their algorithms. It's increasingly difficult to compete with prominent domains in the search results even if there are far more links to your relevant results, etc. It's a consequence of their anti-spam.
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Another issue is that git-scm.com isn't a mobile friendly site and as far as I know desktop results are influenced by whether a site is mobile friendly, starting with <meta name="viewport" content="width=device-width, initial-scale=1"/> and making sure it scales.
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If there's no viewport configuration, it opens up on mobile as a zoomed out desktop site rather than scaling it to the screen. Setting up the viewport metadata states that it's a mobile friendly site and sizes it to the screen. Sidebar would definitely need to be changed, etc.
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It's not a competition for top search result. The official doc is the top search result. It's the inline snippet (I forget what Google calls them) from a non-authoritative source *above the search results* that's the problem.
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More and more Google is letting SEO spammers claim featured snippets for search terms related to their line of business, but where they're not a neutral, trustworthy source of information about the topic.
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In terms of how they've designed it, Atlassian's site will be far more trusted than a small site for an open source project. It's anti-spam that's making it this way. It's harder and harder to compete with major sites because the domain is such a huge part of whether they use it.