He works hard, but his contribution to humanity in the form of Twitter is a tire fire. It's even questionable if humanity is better off for having it.

Square is a fine company, but let's face it, it is not changing the world. It's just another payments company with nothing particularly special to make it stand out.

I don't think you can compare him to Elon Musk, except again, the fact that they both work hard. Plenty of people do.