You are missing a piece of the analogy.

After each key press the size of the letters change, so some become more likely to be hit than others.

How the size of the keys vary is the secret being sought, and this training requires many, many more monkeys than just producing Shakespeare.

Overhead is the same (maybe less if management is smaller and cheaper) but dividends go to workers instead of shareholders.

Downside is that raising capital to grow the business is much harder and it’s much harder to take risks because the effects are not diversified.