What's All the Hype Around Stanley Tumblers?

Please someone explain to me the hype around Stanley Tumblers. I really don't get it and think the trend is rather stupid. It's a cup with a straw. It

The Caledonian Stanley cups situation divides student body

Stanley launches two swirl Quencher H2.0 FlowState Tumbler colors

Dining With Kids, Without Gluten

How the Stanley Tumbler Became So Popular - The New York Times

Is the Stanley Adventure Quencher Worth the Hype?

The Hype Over Stanley Cups – The Lance

Food + Drink - Page 2 of 18 - Jacksonville Mom

Why Does Anybody Need 37 Stanley Cups? - WSJ

Cloudy with a Chance of Peanuts

Is the Stanley 40 Oz Tumbler Worth It? - Shutter + Mint

Stanley Quencher FlowState Travel Tumbler Review

I used a Stanley Quencher Cup for a week here's my honest thoughts

Dots Custom Stanley Adventure Quencher 40 oz tumbler

Stanley 2pk 20oz Stainless Steel H2.0 Flowstate Quencher Tumblers - Abstract Geos/Electric Yellow

WISTERIA Stanley Tumbler Boot -fits 20-40oz

has the cutest holiday accessories for Stanley tumblers –

Stanley Tumbler