So do you have a physical contract or just a verbal agreement? One is enforceable in court the other is not. Your view of EA seems a little naive. Mega corporations like EA, Bethesda, Activision, Ubisoft, etc. do not have friends, they have financial goals and if they perceive you to be standing in the way of those goals they will stomp you out. You may have met a few nice people working for EA but when ordered to they will shut you down or be fired themselves.
It is not a stretch to see how EA might believe Firestorm is drawing attention away from any future Tiberian Sun Remasters.
Other game studios before you thought they had an "Agreement" with EA, and many of them found out what that means the hard way.
https://heavy.com/games/2017/10/studios-ea-has-killed-visceral-games/