The owner of Redbubble and TeePublic has returned to profit while sales keep falling. Its turnaround runs through cheaper fulfillment, shared operations and a bigger bill for some artists.

He grew Wayfair from under $1 billion to more than $12 billion, ran marketing at a health-science startup, and now he is selling copy paper, custom mugs, and a TikTok star to the world. The through-line is a stubborn belief that every big idea should first be a test.