We don't suddenly charge people. We charge per VM you have running. Setting these up is intentionally manual. You can opt in to autoscaling, which will create new VMs for you, but you have to set that up after you've deployed your app.

If you're getting charged you should run `fly apps list` and see if you have more than two apps running.

One thing that trips people up is Postgres. Postgres is just another fly app. So if you moved two apps with DBs, you're probably running four total apps. We prompt you for database info when you do this, though, it's not done in the background.

One problem we've come across is expectations from Heroku users. We are very different (like the Postgres thing, there's no shared tenant postgres). People expect us to be the same. We haven't figured out how to expose those differences to people in a way that sticks.