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As Smartphone Industry Sputters, the iPhone Expands Its Dominance
(www.nytimes.com)
This is a most excellent place for technology news and articles.
Lots of ‘mights’ and ‘ifs’. No concrete evidence. Also they write that it might spread out across lots of manufacturers. And not only that, this is an article from when the iPhone 12 got released, which was the first to include a USB-C to lightning adding to the worry.
Again, you're free to use Google and continue your research yourself. There are lots of them. I took the top result, I didn't vet it because the mountain of evidence is overwhelming.
Cheers.