To sum up all those old affairs in one sentence: this world was one gigantic love-struck mess.
Hecate had no interest in being the supreme god of all gods. She had developed genuine feelings for Hades, falling sincerely and passionately in love with him, wanting to have a grand, earth-shaking romance with him.
Actually, after granting them power, Hecate could have revealed her true form and demanded that the gods of Mount Olympus worship her and revere her as a deity. Or she could have simply laid it all out: I am the Inspiration King of the River of Heaven. Sacrifice Hades to me, and I will grant you power. Even Zeus could have tied Hades to her bed if necessary.
But Hecate refused. She chose to join the Greek pantheon and focus on dating Hades.
As the saying went, if you used lies to test lies, all you got was lies.
When the two of them were deeply in love, Hecate was ambushed and trapped. Hades cheated on her, and Hecate came to see him as an ungrateful scumbag two-timing her. Yet because she had failed to seize the initiative from the very beginning, there was nothing she could do except rage helplessly, until she drove herself mad with anger.
At the end of the day, being love-struck could kill you.
Of course, the gods of Mount Olympus were not entirely innocent either. After granting them power, Hecate had been wandering Earth, naturally attracting the attention of many pantheons. They did not know she was the goddess who had granted them power, but they sensed that she might be incredibly powerful, so they sent quite a few gods to court her.
Zeus and the Greek pantheon he led were not yet that powerful at the time. In order to