C level executives are not paying superhuman out of their own pocket, it’s a company expense. They get a lot of emails because they are in jobs that receives a lot of emails.

I work in a startup and lots of people have superhuman paid by the company because it’s easier to manage emails and just saving a couple hours a month is enough to justify the cost.

You don’t need an app for that, you need a booking software. You’re going to pay a monthly fee and they spend thousands building it