I believe the reason this is considered spam is because
...antispam. No, the actual reasons were detailed in the score block. Humorous such a system claiming to "protect" users from "spam" to be modifying the subject, adding blocks of data *spam* to it, and then itself be *spamming* the subscribers with the result. Like democracy, centralized garbage is what you get when you fail to ship local antispam with the edge MUA's. Decades of teaching 'rely on GovCorp / providers' instead of shipping basic Markov/Bayes/Maildrop features and even spamfilter db seed subscriptions via p2p. It could be worse... Perry Metzger bans you for publicly exposing his censoring of charter-conformant nonspam, such as subscribers legitimately debunking anti-crypto fiat statists on his very list meant to discuss social political security privacy law impacts etc of crypto.
you copied rendered HTML elements
Nope. Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
email is incredibly large paragraphs
Nmp.