Comment by reginaldo

I did it on 2.5 million domains from the various top 1 million lists and here are the ones with over 10 thousand matches:

  11308 include
  12284 stripe-verification
  13377 cisco-ci-domain-verification
  15123 zoho-verification
  15621 knowbe4-site-verification
  18764 Sendinblue-code
  19472 amazonses
  21264 adobe-idp-site-verification
  23791 klaviyo-site-verification
  24156 docusign
  27694 yandex-verification
  34068 globalsign-domain-verification
  55512 atlassian-domain-verification
  65353 apple-domain-verification
  70535 _globalsign-domain-verification
  74467  
 155337 facebook-domain-verification
 400513 MS

1025970 google-site-verification