There was a video on YouTube titled "Who fact-checks the fact-checkers?".

Of course that one has by now been "fact-checked" off YouTube.

So even if I wanted to, I couldn't refer you to what was a very neat presentation of some of the issues with fact-checkers with clear evidence showing where these in fact present misinformation and demonstrate clear political bias.

And that is the problem with fact-checkers. (In this case, the "fact-checker" called YouTube that decided it didn't like the facts presented in said video).