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Re:Yandex ‘leak’ reveals 1,922 search ranking factors by drusepth on Monday January 30, 2023 @10:02PM (#34590318)
Upon closer inspection, they have a lot of weights regarding "yellowness" [0], and several of them say "based on Toloka", which is an antifraud service that assigns colors to violation levels [1].

So my suspicion above is probably wrong, and "yellow" images probably refer to a Toloka score/color for whatever domain the images are hosted on.

[0] https://yandex-explorer.herokuapp.com/search?q=yellow&o=all

[1] https://join.toloka.ai/blog/project-limits/

Re:Yandex ‘leak’ reveals 1,922 search ranking factors by patrakov on Tuesday January 31, 2023 @01:45AM (#34592027)
Wrong Toloka. Yandex has its own Toloka which is a crowdsourcing platform for repetitive tasks that inherently require a human in the loop. In other words, this factor comes from real human assessors hired via Toloka.