“The At Risk Meeting Notifier scans public posts on social media sites and other public online resources for Zoom meeting links. When it finds publicly posted meeting information that indicates a given meeting may be at high risk of being disrupted, we notify account owners and admins by email.
[…] For example, if a given meeting is posted about many times or with certain known disruptor hashtags, we may flag it to you as being at high risk of being disrupted.”

Source : At Risk Meeting Notifier – Zoom Help Center