People also ask
In practice
The theory: because links are votes, enemies could stuff the ballot box — thousands of spam links, casino anchors, links from a poisoned network — and the target’s profile turns toxic. The practice mostly failed against modern systems, for a structural reason: sites do not choose who links to them, so search engines discount large influxes of junk links rather than penalising their targets — a rival pointing spam at you cannot make Google punish you for it.
The residual realities that keep the topic alive: very small sites with thin profiles can see temporary noise when spam links point at them (nothing to dilute with); a site with an already suspicious profile can have its pattern reinforced; and the disavow file exists partly for these edge cases — used surgically when a documented attack cluster persists, not as routine hygiene.
The practical defence is monitoring, not paranoia: a backlink alert on new referring domains, reviewed weekly or monthly; anomalies investigated (a spike of unrelated anchors from one network is investigable); and the standing discipline of a healthy profile — steady, relevant acquisition and a clean outbound record — which makes anomalies visible precisely because the baseline is normal. Content-side attack variants (scraping, fake reviews) have their own handling: canonicalisation, takedown notices, platform reporting.
The honest framing for clients: negative SEO is a monitoring line-item, not a business risk on the scale of buying bad links voluntarily — the latter remains the most common way sites poison themselves.
See also: Toxic links and when to disavow, Link removal requests, Backlink monitoring and link tracking.
Related service: Link insertions.
