You got me interested in the question, and one of the first things I found out is that there is Zipf’s Law, and then there is Zipf’s Law of Abbreviation.

Monkeys-randomly-typing is one of many processes which will indeed generate sequences conforming to the former, and it is perhaps the exceptions which are most interesting.

The latter law observes that the former generally applies to sequences generated for communication, having semantics and usually a grammar. While this may be the expected finding, there is value in having this expectation empirically verified.