Are you implying that you see merit in their attempt to lay claim to this trademark?
Nothing I've said actually rails against truth. Just what they want to talk about.
Added:
Pretty much always.
If you think there's merit here, I'd love to know why. This seems like a slam dunk for Let's Encrypt under US trademark law.
Your point may be clear enough, but not why you think that way. I'm really curious about why a company would do this. It looks to me like a completely boneheaded move. If you explained, maybe that would give some insight.