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Isn't that a really, really juicy target though?

LetsEncrypt doesn't see your private key when you obtain the certificate. So no, it's not _really_ a juicy target.

On the other hand, who's gong to notice a LE issued cert that they did not request in the certificate transparency logs?

The ones who monitor their domains in the CT log.

(Mom-and-pop-stores probably won’t. Other orgs might.)