How does dynamic structured snippets work ?
Re: How does dynamic structured snippets work ?
It's been only 4 days since this new automated feature has been launched by AdWords. It is automatically going to be triggered depending upon the category your site falls in. Also as per the help center reference, it is a factor which is taken into consideration while calculating the Ad Rank. If the advertisers doesn't want it, they have an option to disable this as well.
More details can be found here:- https://support.google.com/adwords/answer/6098371