This summer, soccer fans from around the world will pour into SoFi Stadium in Los Angeles. In New York, they can catch a Mets game at Citi Field. In Charlotte, they can watch the Carolina Panthers at Bank of America Stadium.
But here is one thing they cannot do: avoid Live Nation or Ticketmaster’s fees by walking into a local bank branch, opening a banking app, and buying tickets there instead.
That oddity reflects a little-known legal wall, rooted in the Great Depression, that bars banks from offering many nonbanking goods and services, including tickets, travel services, and...