SEO Sandwitch's 2025 round-up of guest-posting effects, drawing on independent and vendor studies, finds that pages targeted by a sustained guest-post campaign earn meaningfully higher rates of featured-snippet capture than otherwise comparable pages without targeted guest-post backlinks. The mechanism is partly topical: guest posts written for editorially related blogs reinforce the topical authority signals search engines use to choose snippet candidates among already-ranking pages. For SEO teams optimising for SERP feature capture rather than blue-link position alone, the read is that guest posts are doing more than passing PageRank. They are also nudging the entity-association signals that gate snippet eligibility.