The second is to really avoid promoting yourself, or your services, or your business, in these groups when you first join them. Like with any social network, you really need to build trust. And the best way to do that is to simply engage with the content that’s already there. Start replying and making genuine comments about the content being posted by people that could be prospects for you.
What you are in fact talking about, are Google's death stars like the Shopping box, Knowledge Graph etc. It's fully understandable why many SEOs can't stand them 'cause whole categories of websites (price comparison platforms, for instance) have already fallen victim of such death stars, and there will be certainly numerous other portals, which will lose almost all of their traffic in the near future. Despite your (quite good) suggestions on how to circumvent such an issue, the situation for such an endangered portal can be hopeless when it's its whole business model, which a new Google feature makes obsolete. See geizhals.at for a very famous example.
One important thing to note is a website’s domain authority (DA) and page authority (PA). This is a number from 1 to 100 that indicates the strength of a website’s domain or a specific page. DA and PA are two of several factors that go into how a website will be ranked on a SERP. The higher the DA and PA, the better the chances are of that webpage ranking on the front page of a SERP (everyone’s dream!). This number is determined by a few things, such as the age of the website and number of links leading to it (backlinks).
Page and Brin founded Google in 1998. Google attracted a loyal following among the growing number of Internet users, who liked its simple design. Off-page factors (such as PageRank and hyperlink analysis) were considered as well as on-page factors (such as keyword frequency, meta tags, headings, links and site structure) to enable Google to avoid the kind of manipulation seen in search engines that only considered on-page factors for their rankings. Although PageRank was more difficult to game, webmasters had already developed link building tools and schemes to influence the Inktomi search engine, and these methods proved similarly applicable to gaming PageRank. Many sites focused on exchanging, buying, and selling links, often on a massive scale. Some of these schemes, or link farms, involved the creation of thousands of sites for the sole purpose of link spamming.
Although it may have changed slightly since BrightEdge published its report last year, the data still seem to hold true. Organic is simply better for delivering relevant traffic. The only channel that performs better in some capacities is paid search ads, but that is only for conversions, not overall traffic delivery (Paid Search only accounted for 10 percent of overall total traffic).