United Kingdom: Last Tuesday, Mark, a 32‑year‑old graphic designer, was on the underground, scrolling through his phone. He saw a live feed of a Premier League match, a 1‑to‑2.5 odds line on a goal, and within three taps he placed a £20 bet.

United Kingdom: Last Tuesday, Mark, a 32‑year‑old graphic designer, was on the underground, scrolling through his phone. He saw a live feed of a Premier League match, a 1‑to‑2.5 odds line on a goal, and within three taps he placed a £20 bet.