Bittorrent uploaders in general don't have a "business model" but are still a threat and a "competitor" to copyright holders. And are still breaking the law.
The point Comodo guy is trying to make is they invented/own the 90-day certificate, or specifically the magic number 90. If they actually do he has the moral right to be upset (but of course that doesn't mean trademark law or common sense stop being applicable to the words "Let's encrypt")