Besides the questionable ethics of billionaires in general, I'd say Turner's biggest blunder was inventing the 24 hour news cycle, which has since been used to push a lot awful stuff that Ted himself probably found pretty distasteful.

And on the flip side, while Turner was politically progressive, with his personal behavior, he was a hard drinking, loud talking guy who would likely have been villanized by the woke CNN of the early 2020's.