Google is launching a special page that is exclusive to Display and Video 360 users, which will provide clear information on the types of violations that could result in an account suspension. In addition, Google is changing its policies involving ad destinations, videos that are not able to be played, and a ruling that after three offenses, an account will be suspended. Apart from the infractions detailed, Google declared that there is a potential for an associated account to be terminated too. If one of the advertisers in a Google associate account continues to go against the rules, the account could be taken down. Google defines particularly serious violations as "acts so appalling they either break the law or cause significant damage to our users or our digital marketing environment." Google examines their rules and regulations regarding advertising and accounts on a regular basis. It is highly recommended to audit your own account for any rejected ads each week. This article will be revised as soon as Google launches their updated policy page.
(source: https://www.searchenginejournal.com/google-updates-display-video-360-account-level-suspension-policies/472929/)