So there's definitely crosstalk between Links and my YT algo. This, for example, has been saved to my 'watch later' list for some time..
(, Fri 9 Aug 2024, 8:52, Reply)
Merely having your browser load the preview image is enough. No login needed either - it will associate by IP, browser fingerprint etc, so anything loaded on links will affect your suggested videos on YT.
(, Fri 9 Aug 2024, 13:14, Reply)