"That's not going to have CEO John Legere quaking in his boots"
No, it certainly won't, but the fine is still in the millions, not in the tens of thousands, so there's that.
Then there's the fact that it represents a day and half of not raking in the dough, which always makes the board wince.
Finally, there's the fact that they got fined, and a repeat offense will likely cost more (at least, one can hope).
Personally, I'm just glad that a company screwing its customers got a multi-million dollar fine. There's not enough of that.