Concert bot only visits your site because there is an existing commercial agreement between your site and Vox Media as a participant in the Concert marketplace. We do so in order to best inform our decision systems about the environment in which an ad may be delivered to. These signals ultimately help to sustainably monetize your content while respecting user experiences and privacy. Concert bot crawls any given page on demand after our ads have been initially requested there, and may periodically revisit a page to refresh its view with any material updates.