People hate the idea of spending money and then having a bad experience. You can be reasonably sure that with a cup of coffee that it won't be completely terrib

People hate the idea of spending money and then having a bad experience. You can be reasonably sure that with a cup of coffee that it won't be completely terrible, if you have a bad experience you can ask them to brew you a new one. With apps it is a lot more hoops to jump for a less certain outcome.