The Oresteia: "Euminides."

Are the gods in control of their own destinies?
There are many quotes relating to this topic in The Eumenides, but I found one that particularly sparked this question for me: "But I shall give the suppliant help and rescue, for/if I willingly fail him who turns to me for aid,/his wrath, before gods and men, is fearful thing." Lines 232-234
In this quotation spoken by the god of prophecy, Apollo, he admits that he is in some way forced to protect Orestes just as the Chorus of Furies is in some way forced to hunt him as well as all other who commit matricide (or any other type of murder inv…