It was past when people used to make their website standing on top in search results by Link building only. These links could be purchased on any of website whether it is relevant to referring website or not. But recent hard updates in Google policies ruined these all link building destinations. Yes still link building can be done but only where it needed and with relevancy but not spamming. Webmasters, who avoided this update or took it lightly, had to pay much more for unnatural and irrelevant link building. So taking it into count new online marketers are more emphasized with relevancy of link building whether it is paid link building or just through article or blog promotion.
In Google’s recent updates it penalized millions of websites for unnatural links and after penalizing its very tough for them to get back again in search results. Not only Google but other major search engine also followed this strategy for quality web search results. These changes in searching algorithm of major search engines are not only user friendly but also it gave benefit to business persons who are looking to make good business over internet. This update will definitely help them to get quality customers which in turn minimize the cost of marketing.
In conclusion, if you are promoting your business on search engine then link building should be used only when it is relevant to your website.