Yes ETAOIN SHRDLU CMFWYP VBGKQJ XZ is an accurate distribution of letters in common English text BUT this is a distribution of letters in written English. As it turns out, however, written English is full of very common little glue words, like THE, OF, AND, A, TO, IN, IS, YOU, THAT, IT ...

One third of all printed English material is made up of the top 25 words, and the most common 100 words account for almost half. Domain names are not typically sentences, and are often just one or two words. Instead the frequency of occurence of letters in distinct words should be used. For all distinct words in the English dictionary, this distribution is a little different: ESIARN TOLCDU PMGHBY FVKWZX QJ

Already "T" is much further down the list.

Interestingly, this distibution varies by length of word. By the time we get to words of length 13, for instance the order has changed to IENTS ... (So already the letter "I" is the most common letter for longer words without any influence of Apple).

You can read about a full analysis of the distribution of letters and see a complete table of letter frequency against word length here: http://www.datagenetics.com/blog/april12012/index.html

There may be "thousands of companies" that have added an "I" to their compnay name (though it would help your arugment if you quote sources). But even so, this is dwarfed by the 102 million names. Even tens of thousands of new "I" companies is a fraction of a percent change against this denominator.

There are millions of companies/organisations that have domain names, and not all are tech related.

I'm happy to continue debating and will gladly run any queries you suggest using the entire domain name database and the English language database to generate numbers.