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Not really. Tesla is already the vast majority in the US. They are just opening up to try to kill of an already existing worse standard.

What is the percentage split of Tesla vs everyone else in NA?

GB/T should probably be ignored as China being different on purpose.

And CHAdeMO just seems bad compared to the competition.

If you exclude those it becomes a lot simpler.

CHAdeMO / GB/T were harmonized into a new connector ( CHAdeMO 3.0 aka ChaoJi )

although the XKCD meme talks about making a new standard, NACS is already everywhere, tesla is just trying to ensure its ubiquity.