Being... free = Having, then, been set free. Greek. eleutheroo. Only here, Romans 6:22; Romans 8:2; Romans 8:21. Joh 8:32, John 8:36; Galatians 1:5; Galatians 1:1.
became the servants. were made bond-servants or enslaved.
Related Commentaries of Romans 6:18
Romans 6:18
18 Being then made free from sin, ye became the servants of righteousness.