On the net a lot of information can be found, you can find a bit of everything, in particular webmasters can find what they need for working, the most important of all are tips and tricks on how to improve SERP, on national or international level. Despite all these information regarding webmasters work, many of them are not verified so their "value" is dubious. Often someone idea is to interpret certain things in his own way. If the person is able to explain that idea using "convincing" words, the hypothesis becomes a truth, even if in fact it is not. The best thing to do is to verify by ourselves, where there is possible and check the facts. So lately I worked hard to find the evidence relating to the question of "bad links”.
One of my websites dedicated to the market of gambling online, dedicated to a small country, was for years the leader of SERP: the first position for almost all the significant keywords. This was possible because this market wasn't so interesting from the economic point of view and the competitors were almost non existent. Thanks to the issues related to the legislature of many countries that have regulated this market, the revenues have declined markedly and so even those smaller states have become attractive, both for providers and for the webmasters. In July 2013, for the first time I've noticed a change; my website went down to the second place on the Google and then the things proceeded even worse (actually I am on the end of the first page) because I had new, and powerful, competitors, reason why I was forced to deal with my own creativity.
I have identified one of the sites that was before mine and decided to put on it undesirable links from sites dedicated to the adults, most of all, men. At the begging, I've put 6 links, 12 and at the end 24, that is all that were available to me and that I could take advantage of. I was really surprised with the results: my “aim”, after the first 6 links went up from the third to the first place. So, I thought: "Perhaps it's necessary reach a certain percentage of bad links. Even guys from Google should have a little bit of heart, they can't penalize you for a couple of bad things." Reason why I continued to add links but the result was always the same.
Nowadays there are no means indicating how many backlinks has one site so I tried to do the same thing using a lower ranked site. What happened was identical: my "victim" went up to the second place. How this can be possible? Maybe sites for adults are put in the same trash with casino sites so it's valid be linked between them. I should try with other category, the financial services. I reuse previous links. Are you curious to know the result of this experiment? The persecuted has disappeared from the pages of the most used search engine. So the concept of "bad links" is valid but it is necessary to consider the belongings of sites that you link to see if this will be treated as you want.
Someone have already hypothesized that in the end I used the 24 links to my website and that I'm currently on the pedestal. Wrong! I thought about that so many times but I wasn't brave enough to try. And what if I missed some parameters that those with whom I had tried had and I did not? It may be that the reasoning on the percentage of bad links is correct and my "victims" had many more links compared to mine. There are so many questions, only a few answers and just one sure: my site bring me still some money even if it's in a bad position. Making now mistakes could take me away my small profit, one of the last remaining after years of glory. So, why take a risk? I stopped. Because of the fear. Nothing else.