Link preview bots fetch a page when someone shares its URL in a chat app or social network, to build the preview card.
Blocking them breaks your link previews, so keep them allowed but leave them out of analytics and ad requests.
Of the 2 link preview bots with a stated policy, 2 follow robots.txt and 0 do not. Bots that ignore robots.txt can only be stopped by user agent or IP at your server, CDN or WAF.
Transfon Security identifies every bot in this directory in your traffic reports, flags fake search crawlers, and lets you allow, block or rate limit each bot.
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