Tyler Denk has a migraine. His doctor says he’s working too late, staring at screens too much of his day. Denk gets it. He’s still figuring out an optimal work-life balance. But when that screen shows Beehiiv, his email newsletter platform, shooting past $1.5 million in monthly revenue, he doesn’t feel like taking a break. He’d rather keep building.Denk has been a fixture of the email newsletter world since 2017, when his former middle-school basketball teammate Austin Rief hired him to lead eng...