NBA reportedly bans ninja-style headbands in 2019-20

I am not a fan of that head band. But I wonder why it was being banned. There's no explanation given why it was banned.

People in the comment section even insisted that NBA may focus on the players who doesn't play if they don't like the team anymore, also those complaining for the fouls.

If there's explanation about the ban, it will be more understandable.

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