The article mentions Delta positioning itself "as a more high-end airline with premium features that can attract higher-paying leisure and business travelers".

Aren't those the customers less likely to quibble over paid wi-fi?

When I was flying for business (almost exclusively Delta), I would pay for the wi-fi every single flight. And I never thought twice, because I was expensing it.

At worst, I thought it was tacky for Delta to nickel-and-dime me (well, the client, actually). The only time it would matter to me personally, is when I was flying for pleasure, on my own dime.