There are plenty of other chess channels using the words "black" and "white" to describe each side that have yet to be automatically and mysteriously banned. If it were as simple as usage of the word "black" in the various circumstances that might arise during a discussion about chess, surely some of those would have met the same fate, no?
You would think so. I can construct many sets of sentences that could appear in an excited chess commentary discussion that would probably run afoul of various automated censorship systems.
...and black steals a pawn from white here.
White springs his trap and white is now crushing black on the back row.
.. and we can see black is completely dominating white's position.
White is getting killed by black here...
.. and black now has white in a complete stranglehold.
The real problem, IMO, is that we're all left guessing what the reason is. YouTube has a gargantuan task moderating its content, and I don't expect them to be error-free in this: false positives will happen, and that's okay.
But it's the complete lack of transparency, as well as some YouTubers having difficulty getting their accounts restored that's the real issue.
Maybe he used some specific phrase that triggered something? Or maybe he used some words just a tad too often? Or maybe something else? No one seems to know...
