This!

In fact, i would venture to say, any media showing a "bisexual" usually just means gay. They did it to the Black Canary/White Canary from Arrow. She was straight as an arrow, and then all of a sudden she falls in love with a woman, and at first they make it like she's bi, but then they go full on and make her 100% lesbian.

Did the same thing to Harley Quinn and Poison Ivy and countless other characters. I call it hetero-conversion, since they're converting these characters from heterosexuality into homosexuality, and particularly in the media they usually disguise it as being bisexual.