Agreed. This behavior is not benign "naughtiness" (as the YC guys like to encourage), it's parasitic exploitation of other people's hard work. Another group I'd lump in with this group is readthedocs.org
I have in the past, unwittingly read out-of-date documentation because it looked exactly like the source site, and I didn't pay close attention to the URL.
If they were truly ethical, they would not try to impersonate the original sites. It fails one of the most basic tests for trademark infringement (which is, essentially: "might someone in a hurry mistake it for the real thing?").
I'm at a complete loss how you've even come to the impression that RTD does the things you claim it does - because it does nothing of the sort.