How dynamic sitelinks work
These are links you did not write. Google reads your website, matches pages against what the person searched for, and adds the resulting links beneath your ad when it predicts they will improve the response. You are charged for a click on one exactly as you would be for a click on the headline.
The important rule is precedence: where your own eligible sitelinks exist, they are used instead. Google fills a gap rather than competing with your work. That single fact settles most arguments about whether to allow them, because the reliable way to stop seeing automated links is to supply better ones yourself.
Why dynamic sitelinks matter
They make an ad taller and give a searcher more than one way in, which matters most on accounts that never got round to building assets. For a small advertiser with a thin account, they can be the difference between a single-line ad and one that occupies real space on the page.
They also expose something useful about your site. The pages Google chooses to promote are the pages it believes answer the query, which is a free reading of how your site is understood from the outside. When those pages surprise you, the surprise is usually worth investigating.
Where dynamic sitelinks go wrong
The obvious risk is destination. Google can only pick from what exists, so a site carrying a careers page, an expired offer, a login screen or a thin category page may see paid traffic sent to it. Nobody chose that, and it will not show up unless somebody looks at the assets table.
The second is attribution of blame. A line that reads oddly in your ad is often assumed to be a copywriting mistake when it was generated automatically, and teams waste time editing ads that never contained it. The third is switching the whole type off in irritation without adding manual sitelinks, which leaves the ad smaller than it was before.
How to act on it
Write your own sitelinks first, at the right level, with descriptions that suit the campaign. Because manual assets take precedence, that is both the fix and the improvement — a sitelink asset you control will always describe your offer better than a line assembled from page titles.
Then audit what Google is still adding. Filter the assets table to the automated entries, read the destinations, and ask whether you would have paid for a click to each of them. If the pattern is consistently poor, turn the type off deliberately in the automated assets settings. And treat the exercise as feedback on the site as much as on the account, because tidy navigation and honest page titles are what these links are built from — the same groundwork that ongoing PPC management depends on.