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Indeed, Comodo view it as positive to make "optional", defeating the purpose: https://blog.instantssl.com/ssl/certificate-transparency-clarification-requiremen

• dantiberian 10y ago
  To be fair, that was in May 2016 where it was optional, AFAIK today was the first major announcement that CT will be required for all certs in Chrome (although obviously it was always coming). That blog post reads as much about Comodo throwing shade on Symantec as it does about clarifying CT.