Definition
AGS is a long-standing Yandex anti-spam filter aimed at sites created primarily to sell links or to host low-value, auto-generated or copied content rather than to serve users. When AGS is applied, Yandex sharply reduces the number of the site's pages kept in its index — often down to a handful — which collapses the site's search traffic and, historically, also destroyed its value as a link donor because its outgoing links stopped carrying weight.
AGS targets a pattern, not a single infraction: thin or duplicated content at scale, little or no unique value, a link profile and outbound-link behaviour typical of link-selling sites, poor design and engagement signals, and templated mass production. It is essentially Yandex's structural answer to the doorway/PBN/link-farm model.
In context
For iGaming SEO on Runet, AGS is the Yandex-side counterpart to Google's link-spam and site-reputation systems, and it matters most to two groups. First, anyone running or buying from a private blog network aimed at Yandex traffic: AGS is specifically built to find and neutralise those sites, so a PBN strategy that looks fine this quarter can be zeroed out at the next filter refresh, taking the money and the rankings it propped up with it.
Second, affiliate sites that scaled with thin, templated GEO or offer pages and little unique substance — the same profile AGS reads as "made for search, not users".
The protective approach is the same as elsewhere: every indexable page should have a genuine reason to exist and unique, useful content; outbound links should be editorial and relevant, not sold; and growth should come from depth and authority rather than page-count inflation. Recovery from AGS is slow and not guaranteed — it requires removing or genuinely upgrading the low-value pages, cleaning the link behaviour, and waiting for reassessment — so the realistic strategy is to not build a site that fits the pattern in the first place.
Worked example
An affiliate maintains a network of 15 lightly-built blogs to link to its main casino site and rank for CIS keywords. A Yandex filter refresh applies AGS to 11 of them; their indexed pages drop to single digits and the links stop helping.
The main site loses a third of its Yandex traffic and the network has to be abandoned rather than repaired.
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