What is Parasite SEO?
The technique involves exploiting the authority of an established website to rank higher in search results. Domain authority is a score from 0-100 that reflects how trustworthy a site is in Google’s eyes – platforms like LinkedIn and Medium sit close to 100, while a newly launched company website rarely gets above 5. This means a well-written LinkedIn article can often outrank content on your own website, simply because it “lives” on a domain Google already trusts.
A spectrum – Not a technique
Parasite SEO covers three very different approaches.
The ethical version is guest posts and contributions to relevant platforms – a thorough LinkedIn article or a guest post on an industry site, written with genuine expertise. It has worked for decades and still does.
The grey zone is sponsored content and advertorials on major media outlets. Internationally, we’ve seen media such as Forbes and CNN publish entire sections of casino guides and supplement articles with no editorial connection to the outlet’s core focus.
The black hat version is pure manipulation: thin, AI-generated articles stuffed with keywords and placed on random high-authority sites with no value for the reader. This is spam by Google’s own definition – and it’s increasingly getting caught.
In Denmark, the technique has historically been most widespread in competitive niches such as casino, crypto, and supplements, where platforms like Amino.dk and local newspapers have been popular hosts for borrowed authority.
Two updates that changed the rules in 2026
Two events have really set the direction for 2026:
On 24 March, Google rolled out the fastest spam update ever – complete in under 24 hours. Just two days later, on 27 March, the year’s first Core Update began, lasting a little over 12 days.
The pattern was clear: rankings shifted away from intermediary sites (comparison portals, affiliate sites, generic overview pages) and toward destination sources – the original, official sources. SEMrush measured a volatility of 9.5 out of 10 on peak days, and around 55% of all websites experienced noticeable ranking changes, some with traffic drops of up to 33% in the first week.
For Parasite SEO, the consequence was clear: low-quality content placed on authoritative domains was hit hard. Google now rewards topical consistency – a site staying true to its core focus – and deprioritises sites that suddenly feature unrelated sections of affiliate content.
The EU is watching Google closely
In November 2025, the European Commission opened an investigation into the Site Reputation Abuse policy. The concern is whether the policy undermines a legitimate revenue stream for European media – namely sponsored content. Google has called the investigation misguided and maintains that the policy is necessary to protect users from disguised advertising. The outcome could potentially make sponsored content a more viable SEO strategy in Europe again – but the timeline is uncertain.
How to work with it in practice
Parasite SEO isn’t dead as a discipline, but the rules have become markedly stricter:
Think E-E-A-T. Experience, Expertise, Authority, Trustworthiness is now the core benchmark for whether content deserves to rank – regardless of where it’s published. Google is increasingly able to distinguish between a review from someone who has actually used the product and generic text based on specifications.
The ethical version still works. Quality content on LinkedIn and relevant industry sites wasn’t hit by the March 2026 update – in fact, platforms like Reddit and LinkedIn performed well, precisely because the content typically matches the platform’s purpose.
Steer clear of paid content on irrelevant sites. The risk of paying for an article on a media outlet with no relevance to your industry is too high – Google catches the pattern and penalises both the outlet and the advertiser.
Review your own content. If you have third-party content sitting on your own site – guest posts, partner content, or sponsored articles without editorial control – it’s worth taking a critical look at it.
Wrap-up
Parasite SEO is fundamentally about borrowing authority to reach keywords that would otherwise be hard to win. But the past two years have shown that Google is getting better and better at telling genuine expertise apart from borrowed credibility. As long as the EU’s investigation remains open, there’s some uncertainty about where the rules will land in Europe – but until then, the advice is simple: use the technique ethically, stay within your core focus, and let authority be something you build – not something you merely rent.