The Screaming Eagles were part of a pilot project which only ran for a season. However, they will return when the FCFL is up and running.
How do you know this?
Is it stated somewhere publicly?
I'm sorry, I was sure I read it in some official documentation, but all I can find is a message from the CEO in the FCFL Telegram group: "The 8 teams in the league? We only have one, the Screaming Eagles which was our Proof of Concept this past season. You can read about them on our website GQ, WSJ, NYT and others covered the team. The next 7 teams will be designed by the fans starting early next year!"