[mattmaroon]

Many large apps have something like it. Notice that the minute you choose your weapon, it asks you to install.

The reason is to get users invested so they're motivated to click that button. You'd be amazed at how many people don't want to. It has a scary message that basically says the developers will get the rights to your first born child.

So a lot of people throw the avatar creator there before requiring authentication. It's a helpful trick, but doesn't change the fact that to play the app, you still have to install it.