Service abuse: Random Google Firebase sender address with suspicious content

type.inbound
and sender.email.domain.root_domain == "firebaseapp.com"
// random Firebase sender domain
and regex.imatch(sender.email.domain.domain,
                '^[a-z0-9]*-[a-z0-9]{5}.firebaseapp\.com'
)
and length(body.links) != 0
and 1 of (
  // has an emoji in the subject or body
  regex.contains(body.plain.raw,
                '[\x{1F300}-\x{1F5FF}\x{1F600}-\x{1F64F}\x{1F680}-\x{1F6FF}\x{1F700}-\x{1F77F}\x{1F780}-\x{1F7FF}\x{1F900}-\x{1F9FF}\x{2600}-\x{26FF}\x{2700}-\x{27BF}\x{2300}-\x{23FF}]'
  ),
  regex.contains(subject.subject,
                '[\x{1F300}-\x{1F5FF}\x{1F600}-\x{1F64F}\x{1F680}-\x{1F6FF}\x{1F700}-\x{1F77F}\x{1F780}-\x{1F7FF}\x{1F900}-\x{1F9FF}\x{2600}-\x{26FF}\x{2700}-\x{27BF}\x{2300}-\x{23FF}]'
  ),
  // spammy keywords
  strings.ilike(body.current_thread.text,
                "*congrat*",
                "*win*",
                "*expired*",
                "*subscription*",
                "*won*",
                "*gift*",
                "*CARTE CADEAU*",
                "*Votre chance*",
                "*survey*",
                "*livraison*",
                "*delivery*",
                "*package*",
                "*claim*",
                "*rewards*"
  ),
  // entire body is an image with a link
  length(body.current_thread.text) == 0
  and length(body.links) == 1,
  // HTML body starts with a link
  strings.istarts_with(body.html.raw, '<a href='),
  // known spammy HTML elements
  any(html.xpath(body.html, '//*/@class').nodes,
      strings.icontains(.raw, 'eb-drag-and-drop-builder')
  ),
  // multiple links that are identical
  length(body.links) > 1
  and length(distinct(body.links, .href_url.url)) == 1,
  // body link whois email is a freemail
  any(body.links,
      strings.parse_email(network.whois(.href_url.domain).registrant_email).domain.root_domain in $free_email_providers
      or strings.parse_email(network.whois(.href_url.domain).administrative_email
      ).domain.root_domain in $free_email_providers
      or strings.parse_email(network.whois(.href_url.domain).technical_email).domain.root_domain in $free_email_providers
  ),
  // freemail reply-to
  any(headers.reply_to, .email.domain.root_domain in $free_email_providers),
  // link with display text, but no tracking info (unusual for legitimate marketing)
  any(body.links, .display_text is not null and .href_url.path is null)
)