Because of network effects. Venmo is easy enough to use, and most of my friends use it. In fact, I was introduced to it by a friend who doesn't work in the tech

Because of network effects. Venmo is easy enough to use, and most of my friends use it. In fact, I was introduced to it by a friend who doesn't work in the tech industry. You have to understand that for most people, learning a new system is a hassle that they would rather avoid. If Venmo continues to just work, I doubt people would switch to anything else for their payment/ money transfer needs.