I suspect that Crockford gets letters from other companies, but calling out IBM makes for a better story. That's just a guess, though.

The purpose of "do no evil" clauses, as I see them, is to weed out users who take such clauses seriously. People like the Debian project, or IBM.

If the serious grumps are willing to play along and ask for an exception, then you may as well throw them a bone. In receiving such a request you've already extracted amusement from them.