So, it appears that some ISPs are definitely into freeloading. Well, if you asked them, on an seemingly unrelated topic, I am sure that they would tell you how they are actually the good guys and Google, etc. are the freeloaders (the old "content providers" should pay for part of our infrastructure argument)
Like many other DEVONthink users, I have started to feel regret that MarkDown is not natively supported.
Now, a piece of good news is that, as long as you edit a plain-text document in DT, you are, in effect, editing a potential MarkDown document.
In the past, it was possible to open a DT document in an application such as the excellent Marked.app. But it is not any longer. I totally understand the author's argument: as a pure viewer, it feels wrong for an application to register as an editor.