One bitter truth is that majority of the websites don’t make a profit. People develop websites, put their unique content there, build backlinks, still no luck. After some time, people decide to let such a loss-making website go. Soon domain gets expired and the hard work in content development & link building go waste. 

We can leverage someone’s hard work for your benefit. We’ll find such lost websites of your niche, acquire their content back, refine & enhance that content, put it on your website, outreach to the people linking such lost websites, and get the links re-pointed to your website. This is called content acquisition link building. 

But redirecting the expired domain to our website is bad for our website health? YES, redirecting the expired domains to our website is unhealthy. But it done by buying expired domains then using 301 redirects. The content acquisition is a completely different thing. We are NOT buying expired domains and we are NOT using any 301 redirects. We are just finding expired domains to acquire (followed by refining & enhancement) their content. Then we get backlinks re-pointed (which became broken) to your website. The content acquisition is certainly a very healthy, smart, and effective method of link building.