DigiCert posted a message fifteen days ago saying that "We have not used a legal team as a shield against accountability." (https://bugzilla.mozilla.org/show_bug.cgi?id=1910322#c74). This is clearly contradicted by their legal threat against Sectigo. Hence, Sectigo decided to post the "Threat of legal action" bug to make the community aware of what DigiCert actually did.
Maybe if DigiCert had not decided to make that comment, Sectigo would have been willing to stay quiet...
