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There are quite many of them which also raises the frequency of one breaking.

I'm having some trouble with this. The blinks look to be about 1 per second. If that's accurate, it means 31.5 million/year.

In 2013, Apple sold ~150 million iPhones. 21% rate of screen breakage?

The divisor should probably be the total installed base, i.e. all active iPhones in use, rather than one year's sales.

That doesn't seem unreasonable. I find it rare to see an iPhone with its screen intact.