Dib and Tak isn't very "crack" by the standards of its community but all pairings from the show are crack from an external perspective. What I love about it is how it challenges their obsessions and ambitions, showing that in spite of those they still long for companionship and validation. In particular it's a great source of internal conflict for Dib because Tak should be everything he hates but he still feels some kind of desire nonetheless. She also took time to socialize with him when she really didn't need to and had nothing to gain from it, which implies some kind of need on her end. And honestly, Tak is a catch. He'd have to be a faggot not to try.