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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Yes, true. But let's not forget Google's changes do not all come from algorithm updates. For example, the company contracts a couple of companies with thousands of independent contractors who manually review search results. And generally speaking, a lot of the lower quality sites were also riddled with poor writing, as it tends to go hand in hand with other quality issues.
I don't think he's referring to site links but instead Google's penchant for showing a number of pages from the same site. It's a domain diversity issue. Nothing you can really do about it -- it's out of your hands. Can't really think of any negative implications for folks searching for your business.
A link from one page will not hurt you. A wide dismemberment of sitewide links like this could hurt you. I seem to remember Google addressing this with WordPress theme footer links recently.